One on the suction “low” side and one on the discharge “high” side of the compressor. (The system should always be charged on the SUCTION side. POWERWORKS PV4 Brake Proportioning Valve Disc/Disc Brake System Combination. There are two valves on most York or Tecumseh compressors. Allstar ALL48025 Brake Proportioning Valve. Even technicians who have seen these older systems are out of practice, so let’s take a moment here to give some inside scoop on a compressor service valve system. The Thunderbird, a stylish lean burn cruiser, is launched. Since service valves have not been in regular use for approximately 30 years, many certified A/C technicians have never worked on an air conditioning system that has service valves. valve and overhead valve machines with dry-sump lubrication are also produced. Proportioning Valve Remaster Adjustable Proportioning Valve Remaster Master. This caused a blockage in the system, which forced the pressure relief valve to do what it was designed to do – blow. (See red arrow in 4th picture for exact placement. (Replaces 478332) This is the duct that connects the under-dash plenum distribution duct to the left-hand vent air-conditioning ducting. Our replacement contains both the valve and gasket to ensure easy installation and direct fit replacement for 1986-93 Mustang 5.0L. New Original Air reproduction of the 1969-72 GTO/LeMans A/C LH Duct. (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. LRS-9473A- EGR VALVE: Replace your poor and rough idle, acceleration issues, illuminated check engine light, and many more with our EFI-equipped 5.0 EGR valve. 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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