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1998 volvo s70 air conditioner not working.
Car: Volvo, S70, 1998 - Back to Fix-It - Volvo Repair Manuals
Q.1998 volvo s70 air conditioner not working. fans come on for condenser when button is pushed for ac and when I jumped out the low pressure switch. My question is about the ac relay in the main fuse box.
Checked out coil and it is good. When I jumped the no contacts for relay the compressor starts and I have cold air with a low pressure of about 30 psi. I have read about shimming the clutch but it sounds to me that if the clutch needed to be shimmed it would have not picked up. What does control this relay?
Answer There are 3 relays in the system, and My wiring diagram at home does not distinguish locations, just functions. My initial impression, was your pressostat was showing bad pressure.
This is a 3 wire pressure sensor, and its more sophisticated than the low pressure switch. Based upon pressure interpreted, the ECM makes a decision (via a relay) to cycle the compressor off. We call this signal A/C approved Yes/No. I feel fairly confident, because I have seen many 98 s/v 70's with this sensor failure. This sensor is located behind the passenger side head light. If you look down, towards the charge port you will see it.
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