diverbob Posted June 16, 2017 Share Posted June 16, 2017 I have '97 RB688S. Need to know how much R134 is required and what the psi should be on a 90 degree day. Quote Link to comment https://www.bigmacktrucks.com/topic/50201-air-conditioner/ Share on other sites More sharing options...
0 aviatur Posted July 22, 2017 Share Posted July 22, 2017 Your a/c drier doesn't have a sightglass on it? Quote Link to comment https://www.bigmacktrucks.com/topic/50201-air-conditioner/#findComment-375503 Share on other sites More sharing options...
0 tjc transport Posted July 22, 2017 Share Posted July 22, 2017 (edited) should be around 3 lbs refrigerant, 90 degrees will call for 45-55 psi low side and 250-270 psi high side Edited July 22, 2017 by tjc transport correction Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/50201-air-conditioner/#findComment-375504 Share on other sites More sharing options...
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diverbob
I have '97 RB688S. Need to know how much R134 is required and what the psi should be on a 90 degree day.
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https://www.bigmacktrucks.com/topic/50201-air-conditioner/Share on other sites
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