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the compressor protected by a pressure switch it only turn on the compressor if there is a pressure on the system if no pressure it means there a leak on the system try to check
Assuming you hear some kind of clicking noise when you turn the AC on (the compressor clicking on): Seals on the AC compressor likely bit the dust. GM AC compressors go out almost as frequently as tires. The good thing is that they're not horrifically difficult to replace. You can get some freon with dye in it at your local parts house. Get enough to fill it up as though it's empty (as it likely is), and see if it starts blowing cold. It should blow cold for a little while (days/weeks maybe), but when you open the hood, you'll notice some green dye around the compressor. That's where the seals have failed and why you get to be the proud new owner of a brand new compressor (don't waste your time on a used one from a salvage yard. You'll get to replace it again soon, if you do.)
I passed this question the first time I read it, so I will take a stab at it now. The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch. I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ? Speeding up the engine would increase voltage from the alternator. This is assuming the serpentine belt is tight and everything else is working correctly. I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.
if you press the ac button, do you hear a faint "click" inside the vehicle? someplace next to the passenger area floor there is a relay for the ac. Turn the vehicle on and press the ac switch while you are near the glovebox area and see if you hear the "click" if you hear that, your ac compressor is probably dead. If you don't hear that click. it's possible that the ac relay is dead and that's usually cheap at the auto parts store. good luck!
Hi,
Better check the A/C compressor connector, harness, and relay!
test the connector by using a simple 12v light, turn on the A/C system, connect the light to the compressor terminal, and ground the body of the bulb, it light up!
If not, relay and fuse will be at fault!
If it lights up, the compressors magnetic clutch should be replace!
Hope that helps u out!
The locking hub control system is not engaging properly. On the 99 Tracker this is a compressed air system that consists of an air pump (compressor), electrical wiring to power and control the air pump, and air hoses that lead to an actuator inside the front differential housing. If there is a leak in the system the PCM will run the air pump for 10 seconds and then shut off, and your propeller shaft can turn all day long, but the front axles will remain free floating. Turn on your key, not your engine, and engage four wheel high. Go listen near the passenger front bumper for the air compressor. If you hear it, then the compressor control and the compressor itself are likely fine. If it shuts off after 10 secs or so, and your 4WD light isn’t on, the PCM timed out the compressor out and shut the compressor off to protect it. You will have to find the leak and fix it. If you are lucky, it’s the air line leading to the front differential; and not the air line inside the differential housing, or the air bladder in the locking actuator, which also resides inside the font diff. If the compressor shuts off and the 4WD light is on (this means the PCM did not shut the air compressor off due to timeout, so the pressure switch read 5-7 psi and the pump shut itself off), you likely don’t have a leak, and something mechanical has the actuator hung up inside the front differential. Lastly if you don't hear the compressor run at all, you either have a faulty compressor, or some sort of wiring problem in that circuit.....it could be as simple as a blown fuse. Good luck.
You can check it for a leak by getting into vehicle and close the door.Turn ignition switch to on position and shift the gear shifter to neutral.You will hear the compressor turn on.Once compressor turns on put back into park,leave ignition on and exit vehicle.Compressor will turn off when you open door but will turn back on after you close it. Now listen at each corner to see if you can hear where your leak is.
Go to the parts store and buy (for about $10) a mechanics stethescope. It will have a metal piece you can carefully (MAKE SURE YOU DON"T PUT IN THE PATH OF A MOVING BELT OR FAN) put on the top of the A/C compressor, other end in your ears, and with a helper turning the A/C on and OFF, you should be able to determine if the sound is coming from the A/C compressor clutch. If so, replace the compress clutch or compressor. Form the limited info I have, it sounds like the clutch is bad or on the way out.
If the A/C works (blows cooler than the ambient air), it's unlikely there is any problem with valves in high or low pressure side being in wrong position (especially if no one has been monkeying with them ;~) )
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