AC Conversion to 134a - Team Camaro Tech
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post #1 of 3 (permalink) Old Jun 21st, 07, 08:22 AM Thread Starter
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DeAngelo
 
Join Date: Apr 2006
Location: Virginia Beach, VA
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Question AC Conversion to 134a

Currently, I have refrigerant 134 in my 67. I have owned the car for 2 years and can only assume that the proper upgrades were made to allow it to handle 134. Everything appears original/OEM replacement and looks new. It blows cool but nowhere near cold. I was told to replace the POA valve but also read that I could adjust it with a turn of the screwdriver. The whole front end from the firewall forward had been disassembled to powder coat it and install a new engine and most parts are new. I read that if if you ever tore down everything, you should replace the dryer. I am not even sure if the current dryer was made for 134 in the first place. Should I replace the POA valve and dryer? Thanks, Hot in VA!
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post #2 of 3 (permalink) Old Jun 21st, 07, 10:30 AM
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John
 
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Cool Re: AC Conversion to 134a

Yes, the Dryer should be a 134 type to funtion best.
Hopefully the conversion was done correctly and the system will be fine if a few things are fine-tuned.
There is a very good chance that the POA valve, if not replaced, was never adjusted for the 134 conversion. Mainly because lots of info in print says 'they can't be adjusted' ... That is incorrect.
First - I would replace the dryer if it not clearly marked for 134 use.
Next - I would adjust the POA as follows;
1st - hook up the gauges and recheck low side pressure, it should be below 29~27 PSI. If the pressure is high, the valve probably needs adjusted (or the compressor is going bad - but we'll save that for later ... )
2nd - turn the adjustment screw out ( CCW ) @1/4~1/2 turn and recheck pressures, hopefully they will now be down where they should be.
3rd - recheck the internal outlet temps - they should be lower and you'll now be

Hope this helps;
John

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post #3 of 3 (permalink) Old Jun 21st, 07, 10:43 AM Thread Starter
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DeAngelo
 
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Location: Virginia Beach, VA
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Re: AC Conversion to 134a

Thanks, John! That is VERY helpful. I will get a shop to try this. The compressor is a brand new factory-looking one from Year One. I just found out that the dryer is for 134 and is brand new. And I assume the adjustment screw is a simple thing to find on the POA. Hope it gets cold now!! Thanks again! DeAngelo

Last edited by Deangelo66; Jun 21st, 07 at 01:22 PM.
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