Question about 2003 Honda Civic
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?
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.
Posted on Aug 01, 2008
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
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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Posted on Jan 02, 2017
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