Engine Size: 5.7
Refrigerant Type: R134a
Country of Origin: United States
Hello: I have been chasing this down for the last 2 years. I had a compressor failure 2 years ago. I changed the compressor, the condenser, evaporator since the end was broken off by me, and the accumulator. I evacuated for an hour and installed 64 oz. of R134a. The system has never gotten cold when outside temperatures reach the high 80s and up. Some one on the board suggested the changing the fan clutch which I have. I recently had the truck in for some other service and asked the mechanic to check the pressures and said they were OK. So..I don't think I have a leak since it hasn't gotten worse nor any better. Am I dealing with a heater mixing problem??? The heater core valve has been changes also. Is there something in the duct system???A stuck door???? I did notice the other day 90 degrees if I idled for more than 5 minutes the air got hot...when I started moving the air got cooler but not cold. Thanks Arne
What are your pressure's at idle and at 1500rpm? When the compressor failed did you flush the system properly or just change the parts and evacuate and recharge? Just replacing the components doesn't always fix the problem.
I didn't check the pressure, the mechanic did and said they were OK. I did flush the entire system...that's how I broke off the fitting to the eavporator....
I would either ask him for the pressures or rent a set of gauges from a parts store and let us know the pressures. That is going to give us a ton of help. Otherwise we are just throwing out idea's.
I am on the road right now and will be back on Sarurday. He is a top notch mechanic. Can I just assume the pressures are OK. What else could be a cause??? Is the Suburban know for leaking vent damper or defective mixing valves????
When at idle and blowing warm air go out under the hood and see if the system is cooling properly. Feel the accumulator and see if it is getting cold. Feel the inlet and outlet line on the evaporator and see if there is any temperature difference.
I have done that. The lines were cold and about the same temperature...
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