Generically speaking, if the compressor is really running and there is no pressure difference, the compressor is not pumping it has gone bad. BUT, since you say it is not cycling off and on, I believe the compressor is not running but you are seeing the pulley turning only. Also if the pressure is 25 psi, it is too low as in the amount of refrigerant is low. Check the pressure switch to see if it is open or closed electrically. Not sure what the 30 amp fuse powers since you say it worked before. Start here.
SOURCE: 2000 Pontiac Grand Prix interior fan speeds 1-4 not working
Check the ground, the resistors are accully resisnting the Negitive Current.
SOURCE: 1994 Pontiac Grand AM SE turn light does not work
I know this is a dumb question, but did you check the bulbs
SOURCE: my 96 grand prix's air conditioner compressor will
system is low or empty. you need a high and low gauge to properly check it out or just add a can or two.
SOURCE: i changed the blower motor and resistor on my 2005
doesnt work on all speeds? ck the big purple wire at the blower motor, on high speed, it should have battery voltage, if it does, then check the black wire, it should have "0" volts (or ground it, see if it then works). If the purple wire does not have power then fuse #30 (30 amp) may be bad.If the black wire has more than "0" volts then the ground may be bad or the "blower motor control processor" =( resistor) is bad, or the ground for it is bad. the ground wire ends up at the cross beam behind radio. If you ground the black wire at the resistor, and it works, then you have a bad ground at the wire, behind the radio. Good Luck.
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Depending on the ambient temperature 25 psi lowside pressure may not be adequate to operate efficiently.At roughly 70 F lowside pressure should be 24-31 psi high side pressure should be 150-250psi.Would verify that the freon level is adequate prior to to checking anything else and also that a leak did not develop, If charge is ok would continue looking into an electrical issue. One quick test you can perform as well would be to disconnect the lowside pressure switch and jump the two terminals and see if the compressor comes on like this.If it does a good possibility it would be that the freon level is low. If it does not continue with further electrical diagnosis.
That is the problem. The compressor runs! It engages but there is almost no cooling. It WAS working fine last week. Now, it just quit, but the compressor engages and sounds like it is running. i am very confused.
Did the system get recharged? Would do this prior to anything else. If doing this yourself would purchase the type of 134A that contains UV dye.The compressor will still cycle even if the freon level is low but has enough to operate system just will not cool well.
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