Grand Caravan V6-3.3L VIN E Flex Fuel (2007)
High Pressure Safety Valve HVAC: Description and Operation
Operation
HIGH PRESSURE RELIEF VALVE
The high pressure relief valve vents refrigerant from the A/C system when a discharge pressure of 3445 to 4135 kPa (500 to 600 psi) or above is
reached. The relief valve closes when a minimum discharge pressure of 2756 kPa (400 psi) is reached.
The high pressure relief valve vents only enough refrigerant to reduce the A/C system pressure, and then re-seats itself. The majority of the refrigerant is
conserved in the A/C system. If the relief valve vents refrigerant, it does not necessarily mean that the valve is faulty.
The high pressure relief valve is a factory-calibrated unit. The relief valve cannot be adjusted or repaired, and must not be removed or otherwise
disturbed. The relief valve is only serviced as a part of the A/C compressor assembly.
