A/C Pressures
#2788531
06/23/20 04:55 PM
06/23/20 04:55 PM
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Joined: Jun 2005
Posts: 1,534 Florida
CHRGR69
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89 Dakota 3.9. 95 degree ambient temp. Hi and low temps ideally.
Grandma always said I had "hands of gold"!
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Re: A/C Pressures
[Re: CHRGR69]
#2788804
06/24/20 12:51 PM
06/24/20 12:51 PM
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Joined: Jan 2003
Posts: 25,902 Rio Linda, CA
John_Kunkel
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Rio Linda, CA
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At 95 degrees I would expect to see R-12 high side pressure in the mid-to high 200's, low side 20 to 40.
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Re: A/C Pressures
[Re: John_Kunkel]
#2788874
06/24/20 03:58 PM
06/24/20 03:58 PM
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Joined: Jun 2005
Posts: 1,534 Florida
CHRGR69
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Sorry, its retro fitted with 134a.
Grandma always said I had "hands of gold"!
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Re: A/C Pressures
[Re: CHRGR69]
#2789353
06/26/20 08:38 AM
06/26/20 08:38 AM
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Joined: Feb 2005
Posts: 672 Wichita, KS
tmef
mopar
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mopar
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Wichita, KS
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89 Dakota 3.9. 95 degree ambient temp. Hi and low temps ideally. The chart I use says at 95 degrees ambient, low side 50-55 psi, high side 275-300 psi
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Re: A/C Pressures
[Re: tmef]
#2789475
06/26/20 01:15 PM
06/26/20 01:15 PM
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Joined: Jan 2003
Posts: 25,902 Rio Linda, CA
John_Kunkel
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Posts: 25,902
Rio Linda, CA
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Charts based on a dedicated R-134 system might not be relevant for conversions where the recommended charge is only 85-90% of the R-12 charge.
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Re: A/C Pressures
[Re: tmef]
#2789917
06/27/20 03:42 PM
06/27/20 03:42 PM
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Joined: Jan 2003
Posts: 25,902 Rio Linda, CA
John_Kunkel
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Posts: 25,902
Rio Linda, CA
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Operating pressures are operating pressures regardless. So, when a dedicated R-134 system leaks off 10-15% of its charge, the pressures listed above are still attainable?
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Re: A/C Pressures
[Re: tmef]
#2791257
06/30/20 10:17 PM
06/30/20 10:17 PM
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Joined: Jun 2005
Posts: 1,534 Florida
CHRGR69
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I don't have the high side fittings on two of my cars converted to 134 fittings because of what you say, high side has a mind of its own. I go by just touch of hand on the suction line at the compressor and monitoring the site glass. On my Rampage if the site glass goes completely clear I have over charged and can feel the temp change on the suction line. Scientific approach to A/C servicing? No, but it works for me. I agree with the sight glass. When mine was bubbling it was actually colder than when it went clear. I thought clear was golden. Should I release (capture) some 134a so it bubbles again?
Grandma always said I had "hands of gold"!
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