Which one is the low pressure valve? the one on the thinner pipe?
Which is the low pressure valve? the one on the thinner pipe or on the wider pipe?Mine is a Chevy Lumina ands I lost the coloured caps so I now cant remember which is the proper valve in order to add freon gas.
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You will add R134a refrigerant to the low pressure side. There willl be to schrader valves, one for the high, and low pressure sides. You can only charge the low side. To locate the inlet, you will follow the lines off of the a/c if you are not sure where they are, it will have a cap over the schrader valve that reads L, that is the one that you charge.
Get an a/c charging kit, it comes with a can of freon usually with a blue hose, and a small guage on it. The type is R134a.
Under the hood look for the a/c pipes, one has a red cap which is the high pressure, and the other has a blue cap,( that can be anywhere), that's the you need. Unscrew the cap, screw the blue hose on to the pipe, DO NOT TURN CAN UPSIDE DOWN. Start engine, turn on a/c full blast, open valve on can. Shake once in a while. When can is empty disconnect. If no other problems with system, there should be cool air coming out.