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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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OT Ford semi truck, cab heater not working
We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It
was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks |
#2
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OT Ford semi truck, cab heater not working
On Fri, 31 Jan 2014 22:38:43 -0600, Ignoramus16088
wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. You just haven't found them yet. Ford used fusible links on some things for years, so look for those, too. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks I never worked on semis, but the car and truck HVAC switches were sometimes routed through both vacuum -and- mechanical controls. Your best bet is to buy a service manual for your exact truck. Libraries sometimes have them. Or see if your usual truck service manager will allow you to check the schematics at the shop. I "grew up" with Mitchell manuals at work and Chilton manuals at home. Mitchell was $$$$, about $400 a pop, but they had good, solid info. I want to cry: http://tinyurl.com/kkekhyg but odds it has your big rig in it are slim to none. Also check your manuals site. You may have one hiding there. vbg Oh, here you go: http://tinyurl.com/lpmmnfc -- I have the consolation of having added nothing to my private fortune during my public service, and of retiring with hands clean as they are empty. -- Thomas Jefferson, letter to Count Diodati, 1807 Too bad -none- of the current CONgresscritters are willing to do that. -LJ |
#3
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OT Ford semi truck, cab heater not working
"Ignoramus16088" wrote in message ... We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks http://lmgtfy.com/?q=how+does+a+car+...switch+work%3F |
#4
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OT Ford semi truck, cab heater not working
On 1/31/14, 8:38 PM, Ignoramus16088 wrote:
We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Really no experience with the truck in question... however, blower motor resistors are a common blower problem with many vehicles... but, the motor will usually run in the 'high' position with a bad resistor unit. Also, it almost has to have fuses somewhere... I'd start looking at the battery Pos terminal... a cable will run to the starter, and another smaller one to the fuse box. But, the fuse box might be fed from the starters battery cable terminal. Snoop around, bet you find it. Also, think about jumping through any & all necessary hoops to procure a shop manual... it'll pay for it self many times over in cash/time/frustration as the truck ages. Good luck! Erik |
#5
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OT Ford semi truck, cab heater not working
On Friday, January 31, 2014 8:38:43 PM UTC-8, Ignoramus16088 wrote:
We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Here is the Motörhead help you asked for: http://www.youtube.com/watch?v=1iwC2QljLn4 |
#6
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OT Ford semi truck, cab heater not working
On 2/1/2014 12:47 AM, Erik wrote:
On 1/31/14, 8:38 PM, Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Really no experience with the truck in question... however, blower motor resistors are a common blower problem with many vehicles... but, the motor will usually run in the 'high' position with a bad resistor unit. Also, it almost has to have fuses somewhere... I'd start looking at the battery Pos terminal... a cable will run to the starter, and another smaller one to the fuse box. But, the fuse box might be fed from the starters battery cable terminal. Snoop around, bet you find it. Also, think about jumping through any & all necessary hoops to procure a shop manual... it'll pay for it self many times over in cash/time/frustration as the truck ages. Good luck! Erik +1. I've had the motor quit completely with a blown resistor. Doesn't make sense to me either but a new resistor solved the issue. |
#7
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OT Ford semi truck, cab heater not working
On 2014-02-01, Tom Gardner Mars@Tacks wrote:
On 2/1/2014 12:47 AM, Erik wrote: On 1/31/14, 8:38 PM, Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Really no experience with the truck in question... however, blower motor resistors are a common blower problem with many vehicles... but, the motor will usually run in the 'high' position with a bad resistor unit. Also, it almost has to have fuses somewhere... I'd start looking at the battery Pos terminal... a cable will run to the starter, and another smaller one to the fuse box. But, the fuse box might be fed from the starters battery cable terminal. Snoop around, bet you find it. Also, think about jumping through any & all necessary hoops to procure a shop manual... it'll pay for it self many times over in cash/time/frustration as the truck ages. Good luck! Erik +1. I've had the motor quit completely with a blown resistor. Doesn't make sense to me either but a new resistor solved the issue. OK, thanks. Where is that resistor usually, under the dash, or in the engine compartment? |
#8
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OT Ford semi truck, cab heater not working
On 2014-02-01, Gunner Asch wrote:
On Fri, 31 Jan 2014 22:38:43 -0600, Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. It has fuses. You need to find them It may..may have breakers..but it has protection of one sort or another Now what does that "four position heater switch" do? Off, low/medium/high? Yes, this is what it does. i |
#9
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OT Ford semi truck, cab heater not working
Ignoramus16088 wrote:
We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Fuse/breaker panel is behind the dash panel on the right side I believe. Been a while since I worked on an L series. Seems like a couple screws pulls the pad off. Does the fan blow at all using the switch? Usually high is straight through? -- Steve W. |
#10
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OT Ford semi truck, cab heater not working
"Ignoramus23944" wrote in message ... On 2014-02-01, Tom Gardner Mars@Tacks wrote: On 2/1/2014 12:47 AM, Erik wrote: On 1/31/14, 8:38 PM, Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Really no experience with the truck in question... however, blower motor resistors are a common blower problem with many vehicles... but, the motor will usually run in the 'high' position with a bad resistor unit. Also, it almost has to have fuses somewhere... I'd start looking at the battery Pos terminal... a cable will run to the starter, and another smaller one to the fuse box. But, the fuse box might be fed from the starters battery cable terminal. Snoop around, bet you find it. Also, think about jumping through any & all necessary hoops to procure a shop manual... it'll pay for it self many times over in cash/time/frustration as the truck ages. Good luck! Erik +1. I've had the motor quit completely with a blown resistor. Doesn't make sense to me either but a new resistor solved the issue. OK, thanks. Where is that resistor usually, under the dash, or in the engine compartment? on a typical passenger car/truck, in the heater plenum near the blower motor |
#11
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OT Ford semi truck, cab heater not working
On 2014-02-01, Steve W. wrote:
Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Fuse/breaker panel is behind the dash panel on the right side I believe. Been a while since I worked on an L series. Seems like a couple screws pulls the pad off. OK, great, I would never guess, it helps a lot. Does the fan blow at all using the switch? Usually high is straight through? No, it does not blow in any position. i |
#12
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OT Ford semi truck, cab heater not working
Ignoramus23944 wrote:
On 2014-02-01, Steve W. wrote: Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Fuse/breaker panel is behind the dash panel on the right side I believe. Been a while since I worked on an L series. Seems like a couple screws pulls the pad off. OK, great, I would never guess, it helps a lot. Does the fan blow at all using the switch? Usually high is straight through? No, it does not blow in any position. i Most likely the switch. The blower resistors in the older vehicles were only switched in for the lower speeds, high was direct feed. You should be able to find the resistor block in the ductwork of the heater box somewhere near the blower motor. The air across it keeps it cooled. 2-3 screws and it will come out. You can tell if it's bad visually, it will be burnt. -- Steve W. |
#13
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OT Ford semi truck, cab heater not working
"Ignoramus23944" wrote in message ... On 2014-02-01, Steve W. wrote: Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Fuse/breaker panel is behind the dash panel on the right side I believe. Been a while since I worked on an L series. Seems like a couple screws pulls the pad off. OK, great, I would never guess, That's because you're too stupid to realize that it's always going to be located wherever the branch supply harness(es) terminate. |
#14
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OT Ford semi truck, cab heater not working
On Saturday, February 1, 2014 8:52:23 AM UTC-8, Ignoramus23944 wrote:
snip No, it does not blow in any position. i Your posts make it very clear that you're willing to blow anyone who buys from you or that will sell to you for pennies on the dollar. |
#15
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OT Ford semi truck, cab heater not working
"Ignoramus23944" wrote in
message ... On 2014-02-01, Tom Gardner Mars@Tacks wrote: On 2/1/2014 12:47 AM, Erik wrote: On 1/31/14, 8:38 PM, Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Really no experience with the truck in question... however, blower motor resistors are a common blower problem with many vehicles... but, the motor will usually run in the 'high' position with a bad resistor unit. Also, it almost has to have fuses somewhere... I'd start looking at the battery Pos terminal... a cable will run to the starter, and another smaller one to the fuse box. But, the fuse box might be fed from the starters battery cable terminal. Snoop around, bet you find it. Also, think about jumping through any & all necessary hoops to procure a shop manual... it'll pay for it self many times over in cash/time/frustration as the truck ages. Good luck! Erik +1. I've had the motor quit completely with a blown resistor. Doesn't make sense to me either but a new resistor solved the issue. OK, thanks. Where is that resistor usually, under the dash, or in the engine compartment? In the air duct, for cooling. |
#16
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OT Ford semi truck, cab heater not working
On Fri, 31 Jan 2014 22:38:43 -0600, Ignoramus16088
wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks The LNT WILL have fuses somewhere. should be on passenger side dash, there are two screws near the windshield and then the cover flips open, fuses in there. |
#17
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OT Ford semi truck, cab heater not working
"Ignoramus23944" wrote in
message ... On 2014-02-01, Steve W. wrote: Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. The truck, as far as I can see, has no fuses. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks Fuse/breaker panel is behind the dash panel on the right side I believe. Been a while since I worked on an L series. Seems like a couple screws pulls the pad off. OK, great, I would never guess, it helps a lot. Does the fan blow at all using the switch? Usually high is straight through? No, it does not blow in any position. i The blower motor in my '91 slows down and needs re-oiling occasionally. I drilled small holes for a needle oiler in the end caps and cover them with aluminum tape. jsw |
#18
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OT Ford semi truck, cab heater not working
On 2014-02-01, Ignoramus16088 wrote:
We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. Good -- the brushes are not worn out yet, then. The truck, as far as I can see, has no fuses. Anywhere? There should be a number of them *somewhere* -- including fuses for the power feed connector to the trailer. From our motor-heads, I wanted to find out what would be the most typical issue with those fans. Maybe it can help shorten my search for the trouble. Thanks First -- a question: Does it perhaps run -- only when set to high speed? I don't know the semi tractor, but I have some experience with a similar problem in a '96 Mazda Navajo (really a Ford Explorer), and Ford may do things pretty much the same way over a period of time. The one in question accomplished the speed control by low valued resistance elements in the airflow -- an assembly installed into the fan housing. The problem cause: Squirrels or maybe mice building a nest in there and partially blocking the airflow. This deprived the resistance elements of the cooling airflow, and they started sending smoke into the cab. If switched to high speed at the first sign of smoke, the added airflow (and bypassing all the resistance elements) allowed it to continue working. This first happened when my wife was driving it, and when I looked at it, I discovered the work-around of running the motor full speed. If it is this -- look for a multi-pin connector snapped onto the outside of the fan housing. (Is the fan housing under the hood, or hidden under the dash? It was a real pain to get to the resistance element and remove it. Two long screws with very little access, even with the connector unplugged. The actual replacement element was quite inexpensive. Now -- the multi-speed assembly probably works the same way in your older (and much larger) semi, but the resistance elements may not be in the airflow path to the cab. They may be just somewhere under the hood. The trick is finding them. Wiring is sort of like this: +12---------o----o-- (OFF) o---WWW--+ (Low) | +------+ | o-+-WWW--+ (Medium) | +------+ | o-+-WWW--+ (Sorta High) | | | (Full Speed) o--------+------(Fan Motor) ---ground and the resistance elements are simply coils of bare wire, with the highest speed before full being a rather short coil of heavy wire, and each lower speed adding another longer coil of smaller wire, but not too many turns in any of them. Look for the resistor assembly. If you can find it, it is likely to be the problem point, especially if the fan run from the raw 12V sounds faster than you remember from before. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#19
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OT Ford semi truck, cab heater not working
Ignoramus16088 wrote:
We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. OK, so the problem is the fan doesn't run? Anything 1985 vintage would not have electronic speed controls, but probably has a resistor unit that is in the airflow path. So, poke around the fan assembly looking for a block with some wires attached. Pull it, and you will likely see some coils of resistor wire, and likely a one-time thermal fuse. If the fan motor stalls or the airflow is restricted, the resistor unit burns up, and the thermal fuse often is wired to kill even the high-speed setting. These resistor units are fan-cooled, so they have to be in the air path. And, of course, there HAVE to be fuses somewhere. Jon |
#20
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OT Ford semi truck, cab heater not working
Ignoramus23944 writes:
OK, thanks. Where is that resistor usually, under the dash, or in the engine compartment? It's somewhere in the airstream of the heater system. If the blower is on but not spinning [i.e. jammed], the resister often dies a quick death. But the fastest position has no resistor in series; so if that is also dead, look elsewhere. -- A host is a host from coast to & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 |
#21
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OT Ford semi truck, cab heater not working
On 2014-02-02, Jon Elson wrote:
Ignoramus16088 wrote: We have a 1985' Ford LNT9000 semi tractor. Its heater used to work. It was switched by a four position heater switch. It recently stopped working. I just started troubleshooting this problem, and found it to be very painful to do, due to cramped panel and complicated wiring that is hard to access. So far, I have been able to locate two wires that supply electricity to the heater fan. If I apply 12v to them, the fan runs vigorously. OK, so the problem is the fan doesn't run? Anything 1985 vintage would not have electronic speed controls, but probably has a resistor unit that is in the airflow path. So, poke around the fan assembly looking for a block with some wires attached. Pull it, and you will likely see some coils of resistor wire, and likely a one-time thermal fuse. If the fan motor stalls or the airflow is restricted, the resistor unit burns up, and the thermal fuse often is wired to kill even the high-speed setting. These resistor units are fan-cooled, so they have to be in the air path. This is a good start. I am going to work tomorrow and I will work on this semi tractor. It is parked inside, thankfully. i And, of course, there HAVE to be fuses somewhere. Jon |
#22
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OT Ford semi truck, cab heater not working
Ignoramus23944 wrote:
This is a good start. I am going to work tomorrow and I will work on this semi tractor. It is parked inside, thankfully. OH, that makes it MUCH easier to work on! Jon |
#23
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OT Ford semi truck, cab heater not working
On Saturday, February 1, 2014 8:35:38 PM UTC-8, Ignoramus23944 wrote:
This is a good start. I am going to work tomorrow and I will work on this semi tractor. It is parked inside, thankfully. i Put it outside. It can only be fixed outside. |
#24
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OT Ford semi truck, cab heater not working
OK, guys, thanks a lot. I spent some time today with the truck.
It was just like you said: fuses on the right side of the panel, heater switch working with resistors, etc. The problem was, I think, a switch connector coming apart for any reason (possibly people messing with the panel where the heater switch is). Everything is back together and the heater fan works, at least in high. i |
#25
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OT Ford semi truck, cab heater not working
On 2/2/14, 7:16 PM, Ignoramus24227 wrote:
OK, guys, thanks a lot. I spent some time today with the truck. It was just like you said: fuses on the right side of the panel, heater switch working with resistors, etc. The problem was, I think, a switch connector coming apart for any reason (possibly people messing with the panel where the heater switch is). Everything is back together and the heater fan works, at least in high. i Glad your up and going! Erik |
#26
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OT Ford semi truck, cab heater not working
On Sun, 02 Feb 2014 21:16:15 -0600, Ignoramus24227
wrote: OK, guys, thanks a lot. I spent some time today with the truck. It was just like you said: fuses on the right side of the panel, heater switch working with resistors, etc. The problem was, I think, a switch connector coming apart for any reason (possibly people messing with the panel where the heater switch is). Everything is back together and the heater fan works, at least in high. i If it works in high and maybe in Med-Hi, but the other speeds are dead, that's the resistor pack or the switch. Get out your ohm-meter and see which. -- Bruce -- |
#27
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OT Ford semi truck, cab heater not working
On 2014-02-03, Ignoramus24227 wrote:
OK, guys, thanks a lot. I spent some time today with the truck. It was just like you said: fuses on the right side of the panel, heater switch working with resistors, etc. The problem was, I think, a switch connector coming apart for any reason (possibly people messing with the panel where the heater switch is). Everything is back together and the heater fan works, at least in high. If it runs in high *only*, then the resistors are certainly the problem. Just find where it is (somewhere in the housing (ducting) carrying airflow from the fan to the cab -- likely fairly close to it. Look for a multi-pin connector on the ducting. Pull the connector, and you will see (likely) two screws holding it to the ducting. If you are lucky, it doesn't require tiny hands to get to the screws, and big strong hands to turn the wrench -- that is certainly the problem on a '95 Mazda Navajo (Ford Explorer clone, IIRC). Since the problem showed up in mid-winter, and I (unlike you) did not have an indoor place to work on it, it got run on high or off until the summertime. :-) Good Luck, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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