2004 Honda Civic A/C problem

Tiny
DAVID KNISLEY
  • MEMBER
  • 2004 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
  • 200,000 MILES
Clutch engages when a/c is turned off and disengages when a/c is turned on.

thought ac was out with 200,000mi. And replaced compressor, exp vlv, dryer with new parts and correct charge in system.

still did not work correctly and realized clutch was operating reverse from expected, no work has been done to any part of electrical system.

what could cause reversal of clutch operation in this model car

the only way to keep the clutch disengaged and get no freezing, engine bog down, or belt slip, is to leave the fan on and AC switch on
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Thursday, July 1st, 2010 AT 10:17 PM

1 Reply

Tiny
KHLOW2008
  • EXPERT
Hi david knisley,

Thank you for the donation.

Symptoms indicates a possible fault with the PCM or communication error between the multiplex control unit and PCM. The compressor clutch relay is controlled by the PCM Terminal E 18.

This model is known to have faults with the PCM circuit for the compressor but most of them are for the compressor not engaging after some time.
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Friday, July 2nd, 2010 AT 11:54 AM

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