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Old 09-09-1999, 08:15 PM
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Join Date: May 1999
Location: Toronto,On,Canada
Posts: 280
What should the AC pressure read at the low side valve with engine off?Mine read 90 lb
With engine running,mechanic filled witn R 406A to 40 lb suction pressure,is it OK.Car is cool again.
Many thanks for info
Old 09-09-1999, 09:34 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Pressures are usually only checked while running. What kind of refrigerant is that? I've never heard of it.

1987 16V

Old 09-09-1999, 10:04 PM
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Join Date: May 1999
Location: Toronto,On,Canada
Posts: 280
On the bottle in English and French,this is Canada you know says R406A,drop-in R12 substitute or something to that effect and EPA approved,something or others.
Old 09-09-1999, 10:25 PM
Posts: n/a
R406a is an approved R-12 replacement refrigerant composed by weight of 55% R-22/ 37% R-142b / 8% R-600a. It cools very well and has similar operating pressures to R-12.

The suction pressure is dependant on ambient temperature, relative humidity, engine rpm, etc. 40 psi suction at idle/80f ambient temp. sounds okay. I usually operate engine at 2,000 rpm for 60-90 seconds A/C blower on high and look for 22-30psi at 80f with your model car and R-406a. Under the same conditions, duct discharge temp should be less than 45f.

Hope this helps.


1980 240d 4sp
ASE Master Auto Technician
ASE Advanced Engine Performance
Old 09-10-1999, 05:28 PM
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Join Date: May 1999
Location: Toronto,On,Canada
Posts: 280
Thank you very much ,Hatch.Seems like I got a safe alternative to R12 then.

Tom 1992 300E 2.6
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