2000 Jeep Cherokee A/C not blowing cold, compressor would keep kicking on every 1-2 minutes even w/ A/C off, now does not kick in at all. Replaced low pressure cycling switch, no change. R134, shows full. Ideas? Any way to test the high pressure cut-out (would it keep compressor from engaging if broken/stuck in on position)?

SOURCE: 2000 Jeep Cherokee Air Conditioner

If compressor isn't kicking in, check the connector atop the a/c accumulator, beside the coolant recover tank, in the engine compartment. That connector is atop a black bottle, and the connector goes to the low pressure switch. These switches do fail, and you can jump a wire across the connector terminals to see if the compressor comes on (engine running). As this circuit provides part of the ground path from the compressor clutch, if the switch is open, the compressor will never turn on. If the switch is failed, it can be replaced without opening the a/c system. Just disconnect the connector, unscrew the switch, replace it, and reconnect the connector.

Ned C Cook

• 3433 Answers
• Posted on May 23, 2009

SOURCE: low refrigerant prevents the a/c pump from kicking

Low pressue switch rarely, if ever go bad. Do not mix 134 with r-12. Ck twhich one the system uses.
Servicing the A/C - Kits are sold at auto parts stores. While there, ask the counter person if he would show you the connection port. It's on side of the system that comes out of the heater box on thefirewall in front of passenger. .

SOURCE: 2000 Ford Taurus AC compressor not working;

if compressor clutch dont kick in .it has a open in clutch coil.

SOURCE: My airconditioner is blowing hot air. The mechanic

If it is the 3.5 litre it has a triple switch located on the top of the dryer that switch is actually the high pressure switch the low pressure switch and medium when the pressure is medium or you jump it than fans will kick on high he is right about the thermistor for the evaporator he should just apply 12volts to the compressor to see if the coil on the compressor is bad all three are common problems not knowing where the switch is makes me wonder if he even checked the relay or how he knows the compressor isnt bad

SOURCE: 94 Jeep Grand Cherokee is hard to start. If I turn

Has any one soled this yet???????? Because I have the the same prob. but mine is only when it is could out blow 65 it will start but I have to keep my foot on the gas like a carb with no choke