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International Automotive Technicians Network
Re: HIGH PRESSURE 325 PSI
Posted to HVAC Forum on 8/17/2020

Likely your cooling relays, it is a 3 speed cooling fan coming on at 325 would seem only high is working. It quickly drops the pressure to where speed 1 or 2 should take care of it but because they are not working it switches between 3 and nothing. Login to read more.