chico26 Posted July 16, 2014 Share Posted July 16, 2014 Just replaced high side line and compressor. Psi on high side is reaching 450psi low side is reaching 89psi. Any suggestions?Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/36373-ac-psi/ Share on other sites More sharing options...
gearhead204 Posted July 16, 2014 Share Posted July 16, 2014 unless the ambient air temp is like 130f it sounds like you are over charged, or the condenser is not being cooled (no air flow) if able turn eng fan to manual and check. if 90f low side should be about 40ish psi. Quote Link to comment https://www.bigmacktrucks.com/topic/36373-ac-psi/#findComment-253093 Share on other sites More sharing options...
turckster Posted July 25, 2014 Share Posted July 25, 2014 Most Mack day cabs take 3 lbs refrigerant and sleeper cabs take 3.5 lbs. The binary switch should have cut out the compressor way before that pressure was reached on the high side. With a good operating system, the high side should be around 250-275 psi and low side below 30 psi. Quote Link to comment https://www.bigmacktrucks.com/topic/36373-ac-psi/#findComment-253966 Share on other sites More sharing options...
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