R 3500 P/U 2WD V8-350 5.7L (1989)
![background image](/gmc/r_3500_p/u_2wd/v8-350_5.7l/Page-1665001.png)
High Pressure Safety Valve HVAC: Service and Repair
With R-4 Compressor
Compressor Component View
Remove or Disconnect
1. Valve.
2. O-ring.
Install or Connect
1. New O-ring coated with 525 refrigerant oil.
2. Valve.