Long story short…. Rebuilt one of the P38s from ground up. Replaced many, many parts and she works as good as new…. Except…
This was a tyre up restoration. Everything was removed. When it got the the AC system I put as new compressor, condensor, drier, expansion valve and evaporator in. Made sure all was secure. Went about the rest of the work.
Today, I decided to tackle the AC and vacuum test it. Low side will not vacuum to less than -1 and wont even hold that. High side will vacuum down a bit. I’ve obviously got a large leak on low pressure side.
Knowing where the evaporator and the expansion valve is located I’m dreading the replies I am sure to get here BUT…
If I am unable to get any vacuum at all on the vacuum test will my only solution to finding the leak be my removing and rebuilding the entire system again?
OR would it be worth my while to jury rig the pressure switch, forcing the compressor to accept R134 with dye added, so that I can try and source the leak with a black light instead of ripping the whole thing apart? My understanding of the system is that the compressor will not engage unless the system indicates pressure so byp[assing the pressure switch will allow the compressor to run and thereby pulling the R134 plus dry into the lines etc….
Ideally I should have pressure tested the system before assembling the interior around it….