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1989 Plymouth Voyager r12 to r134

Tiny
ELLIOTTRCM
  • MEMBER
  • 1989 PLYMOUTH VOYAGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 109,000 MILES
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?
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Tuesday, June 15th, 2010 AT 9:45 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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)
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Wednesday, June 16th, 2010 AT 4:18 AM

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