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98 chevy malibu ac
Posted to HVAC Forum on 8/25/2013 11 Replies

I have no ac compressor clutch operation. signal is good from hvac controller in console to body control module and wiring is good from ecm to acc relay. Alldata shows that AC request signal comes in on connector 2 pin 22 of ecm but this info is wrong as pin 22 is not used, actually pins 20-23 are not used. I also cannot find where the request signal is coming from as the request starts at the hvac controller and goes to the BFC module but there is no indication of an A/C request signal output to the ecm from the BFC on the BFC pinouts or any wiring diagrams. Also, when I try to actuate the compressor clutch from a scanner it says A/C not equipped. can anyone fill in the blanks for me here? thank you

Zachary Airola
Purrfect Auto Service
Berkeley, California, USA

11 Replies Received (View Replies)


car Vehicle Data

1998 Chevrolet Malibu LS 3.1L

Engine3.1 L
Trans4-speed Automatic (Electronic)