F 150 Super Crew 2WD V8-5.4L SOHC VIN L (2001)
High Pressure Safety Valve HVAC: Description and Operation
An A/C compressor pressure relief valve is incorporated in the compressor A/C manifold and tube to:
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relieve unusually high refrigerant system discharge pressure buildups.
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prevent damage to the A/C compressor and other system components.
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avoid total refrigerant loss by closing after the excessive pressure has been relieved.