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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

31 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi david knisley,

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.

This guide can help us fix it

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please run down this guide and report back.
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Friday, July 2nd, 2010 AT 11:54 AM
Tiny
WILLIEQL
  • MEMBER
  • 2 POSTS
  • 2004 HONDA CIVIC
  • 20,000 MILES
Honda Civix Vp 2004 Ac/Heater does not work
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Is the fan not working?
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
WILLIEQL
  • MEMBER
  • 2 POSTS
Fan is not working
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Okay. Here is the order I would do things. First, make sure the fuse isn't bad. Next, check for power to the blower motor. If there is power, the motor is most likely bad. If no power, you need to work back through resister, relay, and switch to see where power is lost.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
XJXUXLXS
  • MEMBER
  • 4 POSTS
  • 2004 HONDA CIVIC
Air Conditioning problem
2004 Honda Civic 4 cyl Automatic

Hi,

Could someone please provide me with the A/C schematics for 2004 Honda Civic if you have one? My friend and I are trying to figure out why my A/C doesn't work.

The following are checked, but he decided that there is a relay problem. If we have the schematics it would help us a lot to trace the problem. Thank you.

1. Compressor OK
2. Fuse OK
3. Dryer Receiver OK
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could someone please provide me with the A/C schematics for 2004 Honda Civic if you have one? My friend and I are trying to figure out why my A/C doesn't work.

You sure it has the required freon in it and also if the clutch engaging the compressor
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
XJXUXLXS
  • MEMBER
  • 4 POSTS
Thanks for the reply. Yes, I forgot to mentioned that we also checked the freon level and it was okay. The clutch does engaged the compressor, but doesn't disengaged automatically.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Your problem is coming from the HVAC unit
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
XJXUXLXS
  • MEMBER
  • 4 POSTS
Thank you very much. I really appreciate your help.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
XJXUXLXS
  • MEMBER
  • 4 POSTS
Hi,

Do you happen to know where this HVAC unit is located? Could the problem also be the Accumulator? Sorry for lots of questions.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
DAVEP
  • MEMBER
  • 2 POSTS
  • 2004 HONDA CIVIC
  • FWD
  • 82,000 MILES
2004 Honda Civic ex. When started in cold weather the car will not warm up. After running for 7-10 minutes on the hiway it will then start to blow hot air thru the heater but as soon as I get to a stop sign or anytime it needs to idle, it starts to blow cold air again within 10 seconds. We tried changing the thermostat, no help.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It's the main control of the AC/Heating system.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Test the thermostat and check the coolant level and inspect the air blend door/actuator-vacuum
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
DAVEP
  • MEMBER
  • 2 POSTS
Thanks very much.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
BSCOTT157
  • MEMBER
  • 14 POSTS
  • 2004 HONDA CIVIC
MY A/C was working on Friday. When I got in the car on Saturday. It stayed cold while it was working then all of a sudden just would not work anymore. The blower doesn't even come on when I turn on the blower switch. Even if I just turn on the heater the blower will not come on. All fuses that I can find are good. Even the cooling fan runs but I don't know if there is a separate fan for the A/C. What else besides fuses can I check? If there is a relay problem how do I test it?
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi bscott157,

What you are facing is a fault with the blower fan motor.

Try banging on the blower motor housing and test if the blower starts working. If yes, the motor carbon has worn off and requires replacement.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
BSCOTT157
  • MEMBER
  • 14 POSTS
Would this keep the a/c compressor from kicking in?
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
No, the compressor should still kick in if it is turned ON. Just that the compressor might not stay on for too long as the cooling coil would be cold and when that happens, the compressor would cut off.
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)
Tiny
BSCOTT157
  • MEMBER
  • 14 POSTS
The compressor isn't coming on either. Nothing with the a/c works at all now and this just happened all at once. Could the blower switch inside the passenger compartment be bad since the blower wont come on when the heater is set to come on as well?
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Saturday, June 20th, 2020 AT 11:05 AM (Merged)

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