I thought I was just low on freon so I went to charge it and my compressor clutch was not kicking in. So I tried jumping across low pressure switch to see if clutch would engage then and it did not. I then ran a wire from battery to compressor and it kicked in started blowing cold air was working great. I thought maybe I have a bad relay so I took horn relay and swapped them around and still does not work horn still worked with ac relay in it so it was a good relay. So I am thinking there is a problem with my wire that goes to my compressor. I am not sure where this wire comes from can anyone point me in the right direction
The wire for the compressor clutch will come from a relay connected to the thermostat switch under the dash
ac compressors cycle according to cabin temp setting or from the climate control module
SOURCE: ac not cold, compressor does
Its low on freon....you can go to walmart and buy a "DO IT YOURSELF KIT" to save some money.
Hope this helped you ??
SOURCE: AC not running in my 1998 Jeep Cherokee. Changed
Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.
When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.
The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.
The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.
You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.
Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.
Good luck with this repair and I hope my solution helps you.
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Ok guys I am still having issues with this ac. I researched another site and read where you can pull the relay and jump from number 30 pin to number 87 pin and its the same as direct hooking clutch to battery basically so I did and low and behold ac works like this , it blows nice and cold its not low on freon no way. I checked voltage also at those two pins number 30 had 13.7 number 87 had - 0.04. I have never saw a negative reading so I am not sure what this means does anyone have a clue what I should do next thanks.
ok negative reading I guess I had the leads reversed sorry its been a long day so it read 0.04 at pin 87
Tried replacing ac clutch relay with a new one with no change. Are there no avionic or ac guys on here? I am at a loss I also had someone push the ac button inside car on and off to see if relay clicked and it only clicked when the car was started and at no other time. I also checked voltage at all pins with relay pulled to see if there was any change when ac button was turned on and off and there was no change in voltage.
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