First is the fan on or off all the time
Next is it a FET and is there flyback diode across it they can also short.
Does the voltage that controls the FET work properly (might not be the FET)
If it is the FET find out the starting current for the fan and check with
Digi-Key or other supplier and pick a power FET that will handle that
current, for a car the voltage is a lesser concern but pick at least a 100V
unit.
Remember to put a flyback diode across it if there isn't one and a transient
voltage suppressor as well 24V would be good.



"Robert L. Milton, Sr." wrote in message
om...
I am trying to find a component part number or a schematic for a Blower
Control Board for a 1989 BMW with a 535i engine. The board has the number
275 526. L 06 stamped on it, and the Control Assembly has the name BEHR
and
the numbers 90 . 947 . 00 . 842, E 3264/11 and 1 388 629 . 2 stamped on
it.
There are four (4) blower motor settings on the control switch and only
one
(1) works...High Speed! Anyone that can let me know where to find the
replacement FET transistors on the board would be of tremendous help. The
four (4) FET's are all the same. I have looked at the transistors under a
magnifying glass and can find no numbers stamped on them. I do not know if
they are made by an European Manufacturer or not. I also do not know
whether
the FET's or N or P type or MOSFET's, etc. Any help as to the source of
this
information would be very appreciated.
Thanks!