AC mismatch?

neiltee · Monday at 2:01 PM

I did an LS swap on my 1975 K10. A 2004 LS6 from a corvette of that year was installed. Since installation, I've had trouble with freon slowly getting low. I'm wondering if a pressure mismatch could be involved. Could 1975 condenser side be releasing freon because the LS6 compressor side is too high of pressure?
That would not explain why the freon keeps going down even farther, though. Any thoughts on that?

YakkoWarner · Monday at 2:43 PM

The only way to know for sure is to thow a set of gauges on and actually measure your high and low side pressures. More likely is you have one or more failing o-rings in the system or a bad schrader valve slowly letting the gas leak down....

Hunter79764 · Monday at 3:24 PM

Old R12 hoses can leak with 134a, but a condenser should leak at all. O-rings or schrader as mentioned, or just a regular old fashioned leak is much more likely than any issue from a parts mismatch.

75gmck25 · Monday at 7:17 PM

All the conversion guides suggest a high pressure cutout might be needed, but pressures on my converted ‘75 system (Sanden compressor, parallel flow condenser and custom barrier hoses) never go higher than about 200-225.

I also have a problem with a very slow leak, but have not had time to troubleshoot. In my case it’s most likely a Schrader valve, the original evaporator, or a bad o-ring. It took almost 2 years to lose enough refrigerant so that it would not cool well. A quick R134a top off brought it right back

AC mismatch?

neiltee

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YakkoWarner

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Hunter79764

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75gmck25

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