1989 Plymouth Voyager r12 to r134

1989 PLYMOUTH VOYAGER
109,000 MILES • 6 CYL • 2WD • AUTOMATIC
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ELLIOTTRCM
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I have replaced the compressor, dryer, expansion valve and flushed the system. Evacuated the system, installed the reccomended amount of pag oil, and filled the system with 85% of the reccomended r-12 with r-134. the low side pressure is 40 psi, and unit seems to cool ok, not as good as r-12. Question: the site glass still shows bubbles, should more r-134 be added until the glass shows clear?
Jun 15, 2010 at 9:45 PM
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MHPAUTOS
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Hi there,

Thank you for the donation,

R134a is not as efficient as R12 so it will not feel as cold, but with that said, as a general rule, when the system is turned on, the sight glass should bubble up then run clear, so it may be a bit low still, you must be careful not to over fill as well.

mark (mhpautos)
Jun 16, 2010 at 4:18 AM