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There are two valves of different sizes 1 high pressure and 1 low pressure. You should see two silver tunes coming from the radiator are usually on the passenger side of the car follow those ac lines and each one will have a valve on it. There should be a cap on each one. Most cars have them near the front of the car but on occasion they have been on the back by the firewall.
There is no such valve for releasing pressure You wait until the engine cools off then unscrew radiator cap. If you want to drain the radiator there may be a valve located on the bottom of the radiator or on either side near the bottom.
the low pressure valve is the longer skinnier one. The low pressure valve should be on the fatter of the hoses in the engine compatrtment. Try close to the compressor. if you stil cannot locate it i can check my service manuals or the exact location.
You find the AC low pressure at the top of the compressor, orientated toward you , facing the front of the
vehicle. You can also follow the compressor line to reach the port.
The valve is covered a plastic cap covering it. Near the compressor you find two ports, the high port and low port.
To find out which one is the low port, run the air conditioner for a couple of minutes withthe engine on. Then turn off the care and touch the lines from compressor to the two ports covered with
plastic caps. Only one of the pipes will be cold, the cold line will lead you to the low port.
Service Gauge Port Valves
The high-pressure service gauge port valve is located on the A/C receiver drier manifold and tube assembly.
The low pressure service gauge port valve is located on the manifold of the A/C compressor manifold and tube assembly at the A/C compressor.
A/C evaporator core
Thermostatic expansion valve
Manifold and tube assembly—thermostatic expansion valve
Manifold and tube assembly—A/C compressor
A/C charge port valve (low side)
A/C pressure relief valve
A/C pressure transducer
A/C condenser core
A/C charge port valve (high side)
Manifold and tube assembly—receiver drier
Sensor—evaporator air discharge temperature