Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

clutch cycling on/off wont cool..help it's 105 outside!

jhargisknives on Wed August 11, 2010 5:43 AM User is offline

Year: 2001
Make: dodge
Model: ram
Engine Size: 5.9 gas
Refrigerant Type: r134
Ambient Temp: 100
Pressure Low: 55

My low pressure keeps going up/down and kicking the compressor clutch off. The pressure goes up to around 55 then clutch kicks in. As soon as it kick in the pressure drops to around 20 and the compressor kicks off again. Then pressure builds up again and again clutch kicks in. This whole cycle takes about 15 seconds and repeats over and over. I don't have gauge for high side reading. Also the line going in to the firewall is nice and cold. Also, in the cab, when i switch the hot/cold selector back and forth it goes from hot to barely cool.

Edited: Wed August 11, 2010 at 8:14 AM by jhargisknives

GM Tech on Wed August 11, 2010 8:24 AM User is offline

The number one failure mode of mobile a/c systems is loss of refrigerant due to a leak-- find and fix your leak, evacuate and recharge to factory spec. Recovering andweighing the refgrigerant left in your system will confirm the above.

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

jhargisknives on Wed August 11, 2010 8:34 AM User is offline

I have read about the low pressure cycling switch being a common problem. Does this sound like it could be part of my problem? If it was wouldn't it stop cycling on and off totally?

Chick on Wed August 11, 2010 9:40 AM User is offlineView users profile

You system is low, find and fix the leak, or recover and recharge the system with the correct amount of refrigerant and the problem will be solved until it leaks out again, you cycling switch is doing it's job..

-------------------------
Chick
Email: Chick

---------------------------------------------

Freedoms just another word for nothing left to lose

iceman2555 on Wed August 11, 2010 9:49 AM User is offlineView users profile

Could it be the LPCO...for sure.....but for a vehicle of this age that more than likely never had the AC serviced......follow the advice of the GM....get the darn thing properly charged....and then...guess what...a proper diagnosis of the LPCO operation can be conducted.
The major cause of compressor failures.....and low system performance (cooling) issues can be contributed to lack of refrigerant.
A proper recharge is not the purchase of two cans of refrigerant from...wherever.....and a 'superduperidiotproofsinglegauge' charging hose. The system should be charged with the proper equipment to insure that the correct amount of refrigerant has been introduced into the system.
Good luck!!!

-------------------------
The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.