![]() ![]() This caused a blockage in the system, which forced the pressure relief valve to do what it was designed to do – blow. ![]() (This relief valve system was used long before various types of pressure cut-off switches were automatically installed in factory air-conditioning systems back when the old R12 refrigerant cost about 50 cents a can.)Īs soon as a Classic Auto Air troubleshooting technician spoke with our customer’s A/C mechanic, we realized he had unknowingly left one of the service valves in the front-seated (off) position, (see figure 1.) This position is incorrect for evacuating & charging a system. The valve is designed to vent high pressures whenever there is a severe spike in pressure or blockage in the air-conditioning system, in an effort to protect against major component failure. Our customer and his a/c mechanic were initially upset that we sent a defectively rebuilt product, suspecting a faulty pressure relief valve. Working with vintage auto air conditioning systems is a labor of love for us and we like to share tips and tricks of the trade for maintaining these old systems.Ī recent customer of ours purchased a compressor and installed it on his 70 Ford Maverick and brought the car to his a/c mechanic to have the compressor charged with refrigerant. Shortly after, he called us in a panic when the pressure relief valve on the Maverick’s compressor opened during the charging of the air-conditioning system, spraying oil & refrigerant throughout the car’s engine compartment.
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