98 Air Conditioning Electrical Problem
#1
98 Air Conditioning Electrical Problem
OK, I'm new on here but have searched and can't find an answer for my problem, its a 98 with climate control. Here's my problem; air is not working in auto or manual settings, took to shop and pressure was fine, when you hit the air button on dash it blinks 3 times but clutch doesnt engage, check fuse & relay & both ok, I am not getting any voltage to the high/low pressure sensor and when I jump across it nothing, I can jump across the relay at pins 3 & 5 and the compressor kicks on, have switched relays with same results. I can take and run a jumper from a good ground to the ground side of the relay coil and the compressor kicks on but still nothing at the hi/low pressure sensor. not sure if it is an ambieant sensor or even how to check them. Any help would be appreciated, Thanks
#2
The low pressure switch just grounds out the circuit so one side should have ground and the other goes to the PCM.
The high pressure switch connects the A/C REQ output from the HVAC control module to the PCM.
The PCM tells the A/C compressor clutch relay to energize by completing the ground circuit.
Here are a few wiring schematics for you:
The high pressure switch connects the A/C REQ output from the HVAC control module to the PCM.
The PCM tells the A/C compressor clutch relay to energize by completing the ground circuit.
Here are a few wiring schematics for you:
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