AC compressor will not engage. Adequate pressures in system (100 high side) for clutch to engage. Relay works fine also. Control Head has malfunctioning LCD display with 2 bars in the digits missing.
How to check for signal from Control Head to BCM calling for compressor to turn on? How to check for signal from BCM to ECM? Have Auto Climate Control control head. How to check if AC pressure switch is not working? I know compressor clutch is fine coz it will engage if I short the ECM AC power control relay to ground.
Where to find an accurate schematic of the Control Head to BCM circuit for the proper connectors? The Saturn HVAC service manual I have gives different wire colors and positions on those connectors than what is under the dash so I am totally confused!
have the same problem?
Tuesday, July 23rd, 2013 AT 9:32 PM