Main problem: A/C does not blow cold air.
aux fan when car in hot weather stop/go condition. Does not operate full range of speed it should. Also when turn A/C on same pattern. Tries few rotations then stop. Over and over stop/go.
I cant reach the fan motor direct to apply 12 v power since it has a module that controls variable speed.
however can access the connector has 3 wires
one big red+ one big browm- and small black for pulse that will
control variable speed needed.
Q1. Can I apply 12v positive to red and negative to brown and test at least might be high speed mode. Then try red and small black for low speed. Not sure if pulse wire will take negative charge.
I need be absolute sure aux fan is malfunction.
(already checked external temp sensor ok, compressor clutch rotating, freon has correct pressure, a/c fuses ok.)
Q2 Any way jump A/C relays to bypass aux fan and see if can get cold air out of A/C? I understand A/C designed not to function if aux fan is defective.
have the same problem?
Wednesday, September 11th, 2013 AT 1:14 PM