I recently took my Honda Accord to the mechanic and it was found that there was equal pressure on the high and low side AC lines (around 90 psi on an 80°F day). However the clutch was still engaging on the compressor. Is this signs of an internal compressor failure?

And if so, do other components of the AC system need to be replaced in case debris has been spread throughout the system? I ask because this was initially diagnosed as a leak and I have already gotten the condenser and dryer replaced, and I'd rather not do that again.

Lastly, do you recommend replacing the expansion valve along with replacing the compressor? In my research I've seen recommendations to do it and others saying it is unnecessary.

Much appreciated.

  • Welcome to Motor Vehicle Maintenance & Repair! Jun 22, 2018 at 17:15
  • 1
    If the expansion valve were acting up you would be seeing greatly inequal pressures, not equal ones. Is it a variable displacement compressor? If so, the displacement control valve might be faulty and the compressor's swash plate might be basically rotating but not pumping at all (even if healthy). But variable pistons are rare on Japanese cars.
    – Al_
    Jun 22, 2018 at 17:25
  • Year of Honda? Engine?
    – Moab
    Jun 22, 2018 at 19:06
  • Check for the AC relay, and 20 amp condenser fan fuse. Jun 22, 2018 at 19:07
  • 1
    You have to feel a smooth resistance across one whole turn (remember that you're rotating an inclined swash plate equipped with 5 double sided pistons). If you feel any rough spots, bad. If you feel no resistance at all, equally bad.
    – Al_
    Jun 26, 2018 at 14:59


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