Question about 1993 Volvo 850
Similar issue, system charged and compressor will just click on and off, will not blow cool air
A/c system is undercharged, this rapid cycling of th compressor is a sensor issue and the improper temps at different locations of the system is being detected. Simply adding refrigerant is a very poor practice. It's quick and just as temporary. A properly serviced system eliminates these constant problems and repairs and the needless expense that comes with them.Good Luck and keep in mind that a clutch that cycles like that will not last long.
Posted on Aug 24, 2009
If you replace any parts, Its recommended to vacuum the systems first, removing all moister and air out of the systems plus its empty out the line and you can fill the system up more with freon. If compressor is working properly than it would be expansion valve unit. Its located within next to the evaporator.
Posted on Jul 25, 2009
There can be several reasons for this, easiest would be a loose wire at the compressor or a pressure switch.
If it clicks on and off it is likely over or under charged. There are safety pressure switches that will turn the compressor off if the pressure drops under approx 50 psi on the low side or approx 300-400 on the high side, it varies with different vehicles.
If the system was charged properly you are probably looking at a restriction somewhere in the system (accumulator, orifice tube, evaporator, condenser, txv etc.)
Posted on Jul 25, 2009
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Posted on Jan 02, 2017
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