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Jon Danniken[_7_] Jon Danniken[_7_] is offline
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Default Flushing Out a Heater Core

On 12/27/2015 04:34 PM, My 2 Cents wrote:
On 12/27/2015 12:54 PM, Snuffy "Hub Cap" McKinney wrote:

I did the garden hose thing on a old Mercruy Comet I once had, I let
the water run through the core and into a 5 gallon bucket just to see
what and how much came out. A lot of rust, actually a whole lot of
rust. I suppose that heater core was the low part of the cooling system.
I hooked the hoses back up and the heater worked liked new after that.
Prestone makes a kit you can cut the hoses and do the same thing which
might or not be a good thing. This one is on ebay but the auto parts
stores have them.

http://www.ebay.com/itm/Prestone-Ant...-/221978480521


The problem with those kits is that the cap on the fill fitting can
weaken or come loose and end up leaking. It's also not recommended to
flush the entire system from the heater hose; while heater core flushing
is done during a routine flush, it is done seperately from the engine
block and radiator.

Personally, I back-flush the block from the thermostat housing (with the
hose still on), and the radiator from the bottom hose. I just use a
hose gun and pulse the input so I'm not subjecting the system to the
full pressure of a typical residential water system.

Jon