Automotive Air Conditioning Information Forum (Archives)

Genes1971 on Fri April 26, 2013 5:15 PM

Year: 1971
Make: Chevrolet
Model: Cheyenne
Engine Size: 350
Refrigerant Type: R134a
Ambient Temp: 77
Country of Origin: United States

I know absolutely nothing about how an ac system works so bear with me please. I recently had my vintage air gen iv charged by a professional, and it was vacuumed for an hour and held meaning the system should have no leaks. Ok, drove the truck home and air worked well, but truck ran pretty warm so the compressor was constantly cycling so I turned it off until I got home. Came to realize that my fan clutch was shot and my fan was not far enough into shroud to be effective. So I installed an electric fan which really pulls the air. Ok here's the problem, I haven't tried the ac since I upgraded to electric fan and when I did I noticed the clutch wasn't engaging at all. I have power to binary switch from the main unit but no power output to the clutch? Does this mean that I may have damaged the switch because of high pressure? Or might I have caused a leak by running it for a short period of time with high head pressures?

TRB on Fri April 26, 2013 5:50 PM

I would check for leaks. probably has shut down to to a low refrigerant level. But do not just add refrigerant based off of my response.

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Genes1971 on Fri April 26, 2013 10:14 PM

Could they have been caused by high head pressure because of lack of airflow?

TRB on Fri April 26, 2013 10:45 PM

If the compressor has a blow off valve it could. But you need to spend the time to diagnose the issue. You will need a leak detector and a gauge set to help determine what is going on.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

Genes1971 on Mon April 29, 2013 5:52 PM

Ok, I think the problem is that when I had system charged we had to turn the drier around as I had it installed backwards, so I had to loosen 4 connections with o-rings, vintage air says not to do this but I did anyways. I noticed some(not much) but some oily residue on top of drier. Should I put a can of freon with dye in before I do this or go ahead and break lines again, replace o-rings and re-charge?