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Which compressor are you talking about? The air ride or the A/C?
For the air ride, it has fuses and relays. All the door jam switches and cargo doors must be shut.
For the A/C, you would verify that the system has Freon before attempting to replace a compressor. A low pressure switch would deactivate the compressor clutch. The system would need to be Evacuated with a Vacuum pump and then recharged, It is not like changing a starter. After prepping the system, you may need to jump the low pressure switch to get an initial charge of Freon, then reconnect the low pressure harness to the cut-out switch.
You need some type of guage to measure the charge. When the system has enough Freon to let the Low pressure switch provide power to the compressor clutch; the signal will be restored to the compressor.
did you use a manifold gauge, HI and LO side, if your compresor is not engaging probably due to a low charge, because your gages must read about 15F below ambient temperature that translate to on a 80f day uyour gage must read about 95psi on hi and lo (no compresor running)with compressor runing your lo side must be around 35psi and your hi side around 200+ psi depending on amount of air cooling your conderser, also note charging amout tag to not overcharge system, on other hand your problem may be a electricall, check your fuses and MG/C cluth relay by pass it to confirm your compresor is in good working condition.
Autozone.com has diagrams for free when you register your car on their site. You can test the low pressure cut-off valve downstream from the evaporator tank by disconnecting the harness from the switch and using a good size wire to loop into the harness.
If the compressor clutch kicks in, you have either low system pressure or a bad low-pressure cut-out switch. This is a test procedure. Even bypassing direct as you have done can risk damaging the compressor.
Besides Freon, compressors need oil, the right type, and a small amount. There are Freon cans which include an oil charge as well as sealers and conditioners to prevent or fix leaks. Remember that the system has a volume limit and more additives leaves less room for the Freon to work good.
If you have low pressure, it is possible that what is left is contaminated. Freon is a gas. Air is a gas. The system was suppose to start with Vacuum negative pressure by using a Vacuum pump(Loaner item). This means that total volume inside your hoses could be wrong. It is easier to understand when you consider the Freon changes back to a liquid and Air needs a much lower temperature to become a liquid. So you lose volume for the Freon to change back from liquid to a gas. It constantly cycles like this to make it transmit heat from the cabin to the outside.
If you don't have pressure the clutch on the compressor will not come on. Have you checked your fuses. The first fuse you can check is the fuse for the A/C compressor clutch itself. That fuse is in the interior fuse panel. It is in the number 23 position and should be a 15 amp fuse (see 1st picture/diagram of fuse layout). If you have the 3.8 liter engine there is also a pressure switch fuse. That fuse is in the power distribution box located in the engine compartment in the number 24 position and should be a 20 amp fuse. i hope this helps and good luck.
make sure the compressor is working with gas in it , you should see condensation on the low presure line from compresor to firewall should be cold to touich if so set heater/air con controls to recirc button not fresh
The compressor is next to the air box on the driver side under a plastic cover. One plug, two hoses and 3 bolts that hold it down. The hose on the top of the compressor is a quick release. Push in hose and hold red ring at bottom, and it should pull right out
Well if you're trying to bypass the air conditioning compressor, your original serpentine belt will obviously not work as it will be too long. Installing another pulley would really be more work that it's worth and likely cost a fair amount since you'd have to have a custom bracket made, or a mount to fit in place of the compressor. Your best bet would be to have your local parts supply look up the belt for the same make, model, year and engine specs as your vehicle but without Air Conditioning. The g20 uses all the same mounting locations for other belt driven accessories regardless of the presence of an AC compressor. Therefore, the belt should fit just fine. Also, you should spot on the belt routing diagram under the hood that it shows the optional routing for a belt without AC. (It does on mine anyway) Good luck and let me know how it goes.