1994 chevy pickup airconditioning wont take freon

10

Asked by Jul 13, 2016 at 08:28 PM about the 1999 Chevrolet Silverado 1500 LS 4WD Standard Cab Stepside SB

Question type: Maintenance & Repair

I have a 1994 chevy pickup and the ac is not working I went to put freon and
leak stop and it will not take any of it.  Can you tell me what it might be.

2 Answers

13,035

If the AC compressor isn't engaged and pumping when the engine is running then it won't accept a charge unless the system has been vacuumed. Its old enough to have many issues.

1 of 1 people found this helpful.
70,355

Take a very small screwdriver and try to depress the service port valve stem gently. It's exactly like the valve stem on your tire. You should hear a hiss when you depress the valve stem. If so it's open and then you can try again with the refrigerant. But it is possible that a previous owner put a sealant in the system and the valve is sealed shut. You should also be ok with the R134a refrigerant. I believe at GM 1994 and newer is R134a. HTH. -Jim

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