S10/T10 Blazer 4WD V6-262 4.3L (1989)
Hose/Line HVAC: Testing and Inspection
There are three refrigerant line restrictions:
1. Suction Line - A restriction will cause low suction pressure at the compressor, low discharge pressure and little or no cooling.
2. Discharge Line - A restriction will cause the pressure relief valve to open.
3. Liquid Line - A restriction will be caused by low discharge and suction pressure, and insufficient cooling.