Trying to figure out why this Volvo S80 2003 never cuts out the AC compressor and why it has such a low suction pressure. AC works fine and cools very well but freezes up completley. I have evacuated and filled the system with 1000g R134a as label says. I suspected the evap temp sensor and removed it and did some meassurements and it seems to react as a thermistor. Maybe the ohm values are off? Well after some minutes of driving I have 17F (-8C) from the vents and ice is building up. Compressor never shuts off.
Question #1 Why the heck is suction pressure that low to even get such low temps from the vents?? I have never seen evap temps that low in a car.
#2 Why does the compressor not cycling on and off? Can I be sure it has to do with the evap temp sensor? I mean even if suction pressure is too low I would still have cut off from the compressor when evap temp is too low, right?
Friendly format provided to inquire about automotive a/c systems.
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