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 ACC A/C System in Blue Bird School Bus
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bwest
Administrator

United States
3820 Posts

Posted - 07/23/2018 :  08:10:21 AM  Show Profile  Reply with Quote
Hey guys, hope your summer isn't too busy. Can't say the same for me. Been crazy here and in my personal life. Anyway, anyone have an idea about the pressures I should be seeing in these systems at 75 degree ambient? I'm showing 120 high side and 10 low side. It feels cool inside but it's hard to say on such a cool day. My "cheat sheet" says the system should be 25-45 low and 150-170 high. Getting ready to evacuate and charge with proper amount to be sure. However, on a few others I have done this and the pressures haven't changed.

BigPapa
Advanced Member

215 Posts

Posted - 07/23/2018 :  10:51:11 AM  Show Profile  Visit BigPapa's Homepage  Reply with Quote
According to our handy dandy A/C perssure chart, at 75* ambient your high side should be 135-146psi and the low side should be 41-45 psi. My A/C specialist agrees that you first need to verify the charge.
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