R12 to R134a conversion - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-06-2003, 09:39 AM   #11
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I have access to gauges but never really knew exactly what I was looking for in terms of pressure.
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Old 08-06-2003, 12:14 PM   #12
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Do you have the proper procedure for checking the pressure (Fan in front of car, rpms at 2000, etc.)?

High side should be 2.2 times the ambient temperature in Farenheit.
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Old 08-06-2003, 12:44 PM   #13
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Originally Posted by TelePlayer
Cool, so if I convert to the 134 I can just let all the R12 out into the atmosphere and then start with the new !!!!

On a more serious note, one way to get around the evacuation issue is to put maybe one can in, and then let it out, in an attempt to flush the system a bit.
No, it'* a gas; you wouldn't be "flushing" anything useful (and at $65/pound for Freon, that would be a bit of a waste... ).

Is it possible that I may be somewhat low on freon without getting a code? I think it should be colder than it is.
All things are possible. First of all, the compressor is actually operating, right? You can see it turning when the engine is idling? (It may cycle on and off by itself; the main point here is whether it operates at all.) You have decent airflow coming out of the dashboard vents?

Assuming Yes to the above, does the air temperature get noticeably colder occasionally while you're driving, such as after making a sharp turn (especially a left-hand turn)? This could indicate that you're low on Freon. I'm assuming you are, from what you're describing, plus it'* normal to lose the stuff over time (i.e. years) as it can permeate right through the hoses, long-term.

But given the price of Freon, if your system is otherwise in working order, go get the system pressures measured correctly and see how much you really need to add.
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