- 4,365
- 4,092
- 113
- Location
- Brentwood, Calif
its doing this with No r134a and no shraeder valves? LolIt does engage and disengage with the switch so the clutch is working. But yes, it would run even with no pressure in the system. It does blow nice cold air. Around 20 psi low side and 110 high side with 65 degree ambient temps.