No cold air AC Compressor clutch is engaged Low pressure is "0" tried to add Freon and immediately jumps to 150 psi relieve pressure and again immediately back to 0 with clutch still engaged never seen this before - how can the clutch be engaged with no pressure on LP side?

  • Welcome to Motor Vehicle Maintenance & Repair! Commented Mar 21, 2022 at 21:00

1 Answer 1


Most likely the system is plugged. You never state what your high side reading is ... more than likely it would scare you if you did see it. If it's plugged and you still have pressure on the high side, I can see that it might engage that way. It definitely wouldn't be good to run it too long that way. You also wouldn't see anything in the way of cooling going on, either. You don't mention anything about the vehicle in question, so can speculate no further on where that plug might be or what's going on beyond that.

  • High side 180 psi - and I have let the system run for the past hour and the lp side is now up to 30 psi.
    – G Stan
    Commented Mar 21, 2022 at 21:38
  • 2009 Honda odyssey
    – G Stan
    Commented Mar 21, 2022 at 21:38
  • I agree with your opinion - I can repair most issues but will pass on this one and will take to a professional thank you
    – G Stan
    Commented Mar 21, 2022 at 21:51

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