I have an 88 cadillac deville, 4.5L. Tried converting the R-12 to
R-134a. I got some freon into the system, however it is not cooling
down significantly. I have the same problem for a 91 Honda CRX. I
did the following for both cars. While car was running evacuated what
remained of the R-12, within a few seconds. Then reversed the
procedure and recharged the system, with the ac running on high. For
some unknown reason it only takes less than 12oz [5psi]? Any
suggestions will be helpful. Why will it not take anymore or get
In order to do this right, one needs a vacuum pump, to completely evacuate
the system before putting in new coolant. That definitely takes more than a
few seconds. I'm not sure but I think that is done with the A/C (and
Now for the really bad news. Unless you change the compressor (and maybe
some other components.....don't remember), the R134 probably will not cool
sufficiently in low speed operation, i.e. stop & go driving around town,
even if you do the procedure correctly and get enough coolant in the system.
I had that done to a pickup truck. They warned me up front about the
drawback and damned if they weren't right!
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