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.
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.
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.
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.
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there won't be a switch,, its automatic,, if its electric,, and is run by a relay located in the under hood fuse box, if you have 2 fans, one is for the ac, and it will start up when the ac is turned on
yes it does, check the relays to the fans, and also the fuses, they should be in the under the hood fuse box, once you determine that the fans work ( turn on the ac and see if it starts it should ) you can move that relay to the normal fan relay spot, ( if you have 2 fans ) if your car still over heats after knowing the fans are working,, check the thermostat
This indicates that the booster fan for AC has failed. If you look in back of the radiator, you will see 2 electric fans. One is for the engine cooling, and the other is a booster for when the AC is running to provide for extra air flow through radiator and AC condenser. (May also apply when engine overheats, but not sure of that) As car is moving along, then air is pushed through allowing AC to work. When standing still, and fan failed, then no air (or less air) passing over condenser grill. (Condenser is the one in front of the radiator) No cool.
While standing still with engine running, open the hood and look at fans. Watch your fingers. Fans can start at any time. One may be running or not. Now turn on AC and look at fans. Both should come on together. If not, then it may be either the fan, or the fan relay or fuse. Or even the wire.
Does the engine get extra hot while standing still running? Let it sit there for ten mins or so and see if main fan kicks on. Watch your temp gauge, you dont want it to boil over. When the temp reaches the level it is at normally, one fan should kick on. If temp keeps climbing and no fan, then that may be the same issue, likely the main relay.
there is a pressure switch on the ac drier that is the big silver can looking thing by the dash under the hood... if this goes bad the ac compressor will not kick on and the fans will not run when the ac is turned on... if the fans are not running at the same time of the ac compressor it will not blow cool..
The relay center is under the hood, there should be several with the same #'s switch one that you know is working in place of the fan relay, if fans turn on replace relay. It is faster to turn on ac after switching relays for diagnostics as fan should run as long as ac is on...
you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.
Check the two relays in the fuse block under the hood. One is forthe primary and the other your secondary fan. Turn on your AC unit both fans should come on. If not replace the relay. Also you have two temparture sensors that could be faulty.