· Premium Member
Alfa romeo 164S, Giulia QV CCM
Replace the expansion valve with a New one, they are all R134a now and will work with R12 but not the other way.How well will this work with the original expansion valve? Maybe I should just buy a set of A/C hoses from a '94-'95 from APE? Will they bolt right in and make for the utimate retrofit job?
I found out that problem just recently when my new expansion valve crapped out on me, I used my old r12 and it produced higher temps. Finally replaced with a new R134A and I am getting 38˚F from the vents on a 100˚F + day.
I suggest buying the 24V hoses, flushing them several times with mineral spirits, both ways, also flush evap (not POA valve though) . Replace R/D (R134 specific so 24V), Expansion valve, HNBR o-rings, pressure switch if you see fit, might as well, POA valve from a 24V as they are calibrated for R134a and the R12 may be OK but you may not get optimum results.
You may be OK with existing condenser if not clogged and fins in good condition. May want to get a fin straightner and try to flush condenser while your at it to clear any debris!
You can't use the 24V hose from POA to compressor though.
I used the compressor to cond and cond to R/D.
I was lucky and the POA to Compressor was already r134 rated.
Good luck, you should get good results if done right. Evacuate no less than 1 hour.
Nylog is a good thing to have as well. Put on threads and O-rings for a good seal, also keeps seals from drying out.