2000 ls sedan
 

I have a 2000 ls and having a/c trouble. A/C was working fine last night and today would not come on. I checked relays, fuses, freon, all good, electrical power is good to compressor. The clutch is free but not spinning. Is this a compressor problem or a clutch problem? Thanx

If it's A/C: The first thing you need to do when working an an A/C unit is to put a set of gauges on it. Your welcome.

I'll ask one question..............does the heater and blower motor operate?

2000 ls sedan
 

Yes the heater and blower work fine. thnx for the reply

is the clutch getting the signal via the relay to engage?

2000 ls
 

Yes I also switched relays and re;ays are fine

Take a heavy gauge wire, and hook to the positive (+) side of the battery. Start the engine, and carefully touch the wire to the clutch control wire on the compressor. Does the clutch engage, and turn the compressor ??

Gauges high and low set

Tried jump wire and clutch did not engage, also no power to pressure sensor?

thanx for the info I guess I really have to get me a set of guages!!

AutoZone will rent you a set of gauges.

Direct voltage to the clutch control wire should cause the clutch to engage

2000 ls
 

ok got a set of guages low side is @145 and high side is @150 does this mean compressor problem? maybe just clutch because tries direct wiring and nothing system is getting electrical power

Holy smoke!! An "ambient" reading of the system shows 145-150? Oh my gosh!

Normal "ambient" pressure should be about 70-70 on a non-operating system. I would not even attempt to work on that system - too dangerous. Take it to a professional, have the system pumped down and recharged, and hope for the best.

2000 saturn ls
 

There is very very weak electrical power to the pressure sensor, is that a weak ground? ?

what is "weak power"?

I believe the pressure sensor switch should be normally closed (NC) if pressure is within range. If pressure goes out of range the switch pops open and breaks the current path to inhibit operation of the system.

Derf is right -- and it's actually a "trianary switch"....

That means if the pressure is too low, the switch opens, and if the pressure is too high, the switch opens -- neat, huh?

Wondering the same thing ........

ls sedan 2000
 

new compressor, recharged with freon new diodes good fuses but still no a/c?

Maybe the switch in your dash is defective?

Hey thnx for everyones help finally GOT A/C!!!!!! Pressure switch and wiring were bad!!!!

Thats the problem with trying to diagnose cars over the internet. Without having the car the best guess of all is just a guess. With enough people the correct guess will come along sooner or later.

I'll say thanks to you for having the common courtesy to give a heads up to those that tryed to help you on this forum.