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Newbie/ DIY AC Help

tulsa442 on Thu May 08, 2008 11:44 AM User is offline

Year: 1996
Make: Chevy
Model: Silverado
Engine Size: 5.7
Refrigerant Type: R134a

Ok, I have always done all auto repair on my own, but I am ignorant when it comes to the ac system. My a/c stopped working, so I did what most uneducated people do, I tried to recharge it. Baught some R134a from walmart, it it was cold for a few days, then it's like it leaked out. Compressor was kicking on and off, then just off. I recharged it again and added some stop leak/red dye. Never found a leak. I don't want to have to pay someone to do work on my truck, but it is getting hot again. Any tips/advise would be much appreciated. Just need to know where to start.

mk378 on Thu May 08, 2008 11:53 AM User is offline

Assuming you are writing here because it still leaks, start by finding the leak. The compressor shaft seal is one of the most common leaks on GM systems. You may need to pull the clutch plate off to see the oil and dye that has leaked out. A sniffer leak detector should find it instantly if there is still any pressure in the system. Not finding any leaks under the hood, you could also look for dye at the evaporator drain tube, where condensed water drips out of the truck.

Stop leak is bad news. UV dye is more effective than red dye too.

GM Tech on Thu May 08, 2008 12:01 PM User is offline

Does your pump look anything like this?

If so you have the imfamous "belly Leaker"

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

tulsa442 on Fri May 09, 2008 10:43 PM User is offline

Doesn't look like that. I'm certain there is a leak. What I put in there doesn't stay. So, I guess i'll start by taking the clutch plate off and look for red dye....

How does the sniffer leak detector work?

Also looks like I'll probably be getting a manifold guage set and a vac pump...

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