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Originally Posted by Dave
1. How long did you vacuum the system down and what was your reading when you finished vacuuming the system
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Only one hour. I've done it this way on all of my Mustangs and it's worked every time. I had 28 inches of vacuum.
Quote:
Originally Posted by Dave
2. Did you wait till the next day and check readings again, to see if the vacuum held
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I did not wait more than the hour. Again, never had to do that in the past on Mustangs, even when they have been opened up for a year or more and I've never replaced the accumulator on any Mustang.
Quote:
Originally Posted by Dave
3. The other thing to consider is the OEM condenser and evaporator were designed to operate for pressures for R12. 134A operates at a different pressure level, meaning the OEM evaporator and condenser will not be as efficient converting 134A back to gas and then to a liquid.
Eliminating the possibilities one at a time is how you'll find the issue.
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System was already running 134A prior to the LS swap, so it should work. The only significant difference is the compressor it ran prior was the R4.
I only know enough about AC to get by, so I'm basing everything I've done here on what's worked in the past on Fox Mustangs. This is my first dive into LS motors and Chevy AC.