Model: Seirra HD 2500
Engine Size: 6.0
Refrigerant Type: 134a
Pressure Low: 34
Pressure High: 200
Country of Origin: United States
Text My A/C works fine normally in my Truck.
I have checked Hi side and low. Needles are steady and no signs of blockages.
The A/C is definitely cooling the air then for no reason known it stops and blows hot.
However, when it does stop working I park the truck overnight go out in the morning and the AC is working fine. It has occurred twice now. Just drove over 1000 miles on a trip and no issues. I am puzzled! I have check connections, low side readings high side readings and all are within normal range. The clutch seems to be working correctly.
One Nickle is more than No Nickles. And a Billion Nickles is allot of money.
Check the air gap on the clutch.
I'll admit a stupid mistake....when I plugged the connector into my compressor on my '90 chevy 5.7L, I installed the prong on the compressor between the rubber boot and one side of the female connector, rather than INTO the connector. Worked fine for a day or so, then started blowing warm. Easy fix once I noticed the mistake. An unlikely case unless you've touched it recently. Air gap far more likely scenario.
Edited: Tue August 20, 2013 at 12:15 AM by webbch
Very common issue- crawl under your truck next time it is off when it should be on- and whaaaaap front of driver with a wooden hammer handle- if it engages then you have the worn, wide air gap- then pull off clutch driver and remove the widest shim- replace and be good for another 100k. I've done a dozen or so just like yours..
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......
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