Question about 1998 Chevrolet S-10 Pickup

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A/C Won't hold a charge. I went and bought two cans of R134, and put them in my A/C, It blew cold, and I even went out to make sure it was still working a few times after I put it in. When I went to get in my truck tonight, The compressor just continued spinning and shutting off repeatedly, I guess you would call it short cycling? Before the compressor spinned for a long time and it was blowing cold, But it went back to it's old way (short cycling) within 6 hours of putting the refridgerant in. I put in some leak detection dye with the R134, and I can't find a leak... What else could it be? I'm actually trying to sell this truck and The A/C working is one of the top questions I get...

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You have a leak. If the refrigerant pressure [amount] is too low the compressor will not turn on . And to see the leak detector dye you must use a florescent light.
The reason it repeatedly works, then stops working is caused by a switch that will inhibit the compressor from turning on with low refrigerant pressure. After it stops working the refrigerant makes its way through the system and builds up pressure at the low pressure switch again therefore allowing the compressor to work again.

Posted on May 01, 2010


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