Pinpoint Test U: The A/C (Air Conditioning) Compressor Relief Valve Discharging

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions
The A/C pressure relief valve normal open pressure is 3, 447-4, 137 kPa (500-600 psi).

Possible Sources
- High system pressure
- A/C pressure relief valve

U1 DIAGNOSE THE A/C (AIR CONDITIONING) COMPRESSOR RELIEF VALVE

Start the engine.

On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

Using the appropriate manifold gauge set, check the A/C high side system pressure.

Is the high side system pressure above the A/C pressure relief valve open pressure [3, 447-4, 137 kPa (500-600 psi)]?

Yes	REPAIR the A/C system for a restriction. REFER to the appropriate Refrigerant System Tests GENERAL PROCEDURES .

No	INSTALL a new A/C compressor. REFER to the appropriate Removal and Installation procedure in the appropriate Climate Control System article.