I have a 64 coupe with factory air. The a/c works fine for about 10 minutes or so after starting the car cold and then it gradually quits cooling. It was converted to 134 a couple of years ago during a complete restoration. I just replaced the expansion valve and that at least got it to blow cold. However, it does not work for more than a few minutes. Anyone have any ideas of what could be going on? Thanks for any help you can provide.
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Re: A/C Problem
Well I guess the question I have is does the compressor still run after it stops cooling?if not does the airflow slow down or does it just go to outside air temp? If it slows down air flow it could be a frozen evaporator..over charged 134 will do this..but a few yes no's.. -
Re: A/C Problem
I think so! How can I determine that?Comment
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Re: A/C Problem
Well the ac compressor end gets pulled into the ac pulley by a magnet..you look at the center of the compressor when you first start it you should be able to see this..anyhow who put in the expansion valve?Comment
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Re: A/C Problem
A local GM mechanic. He knows a lot about a/c. However, he is not a specialist and he is wondering what to do next.Comment
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Re: A/C Problem
Ok that's great..still need conditions for diag..what's it doing..ac pressure high and low..how much 134 did he put in verses how much r12 it used to take..Comment
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Re: A/C Problem
We used a conversion chart to put in the 134 so I think we got the amount right. I just drove it again and it is leaking some oil or leak detector out of the front of the compressor. Also it's making a whistling noise aroun the evaporator core. When I just drove it the air worked for about two minutes and then quit.Comment
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Re: A/C Problem
I would look at the water control valve. If it does not cut the flow of hot water, it wont cool. When you start it up initially the water is cold, but as the water temp rises it heats the air.Comment
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Re: A/C Problem
That sounds logical. I will check it. Thanks!Comment
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