Model: K2500 HD P/UP
Engine Size: 6.0
Refrigerant Type: 134A
Ambient Temp: 86
Pressure Low: 45
Pressure High: 180
Country of Origin: United States
I just replaced a leaking high side port, and after adding freon the clutch stays engaged. The discharge pressure got real high (350-400), so I removed some of the freon and now the pressures are 180/45. The system is blowing cold, but there is no cycling and the clutch stays engaged. I did hear the pressure relief valve blow when the pressures were running high.
Newbie w/ troublesome 2001 Chevy Truck AC
Best to start with recovering the freon nd weighing in the correct amount. At this point you're at now, you do not know how much is in the system.
High side too high- is there adequate air flow through condenser? Is clutch fan working? Sprinkle garden hose water on front of condenser to test system....
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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