Question about 2003 Honda Civic

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Ac not working

Fans not turning on and I checked the fuses under the hood and all appear ok. AC switch LED turns green indicating that AC is selected. Is there another relay somewhere that could be bad. i.e. shouldn't the fans turn on as soon as I turn on the AC?


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  • Anonymous Jul 12, 2008

    My a/c used to work intermittently (more often then not). Now it doesn't work at all. If I force the a/c compressor clutch relay closed it runs and blows cold air. I've bypassed the high and low pressure sensors but no change. The green light on the a/c button goes on and off normally with each press of the button.

  • perovika2k Jul 19, 2008

    My a/c was working fine and 5 seconds later all of the suden stopped working but the green light remained "on" but there is no fan sound or anything it just ignore as if i didnt do anything what could it be wrong?

  • Renato Sanchez Jun 03, 2013

    Well I have the same problem with my ac when I turn the ac switch the lied green light it's on but there is no air compressor and no fan sound at all and I see the the temp sensor cables but I'm new on this and I see three red cables that go to the plug that is coming from the air compressor and I was wondering if I can get a little more help on how to by pass the system I will appreciated if anybody can help me thank you

  • Anonymous Mar 17, 2014

    I left the lights on one night. They went off on their own, but now I have no dashboard lights or tail lights. I have checked the fuses on the driver's side and checked the relay switches under the hood. The relay switches are not bad and the fuse seems to be okay. It is a 2003 model. What should I check now?


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I had the same problem with the over temp sensor on the compressor. I had it repaired at the dealer for $200.00 plus. I just had the same problem reoccur. This time I bypassed the switch myself.

There is a small wire harness that runs from the compressor above the radiator, inside there are three wires. After determining which ones to jump " two smaller gage blue" the AC system works fine in all modes.

Thanks "Guset"

Posted on Aug 01, 2008

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The system has several safety switches to make sure the system is in working order before engaging the compressor. If there is not sufficient charge in the system or a bad pressure sensor it won't come on. If the compressor clutch doesn't engage, if the compressor temp sensor is tripped (as mentioned by others). It could also be a relay, though less likely.
Another common problem on this model is the eld (electronic load detector) which is integrated into the under dash fuse panel. This will have other symptoms as well, such as door locks quit functioning. The only solution in this case is to replace the fuse panel.

Posted on Jun 17, 2015

Mine is the "guest" above. The solution was to bypass the temperature sensor mounted on the compressor housing. I have not replaced the sensor yet but that appears to be the ultimate solution. According to Honda its a common fault.

Posted on Jul 29, 2008

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Most cars use a separate relay for large load accessories such as the AC. Under the hood, there should be a power center where the relays are located. There should also be a diagram of which relay is for fuel pump, AC, etc. One way to test them: Locate the relay in question. They are all numbered, rated , etc. You can swap like numbered relays to see if that's the problem.

In addition, some cars use a BCM or ECM to control AC functions. if this is the case, only the dealership can properly diagnose the car.

Posted on Jul 17, 2008

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