How should the the radiator fan & A/C fan operate when the A/C is turned on?


Asked by Apr 11, 2014 at 10:32 PM about the 2013 Honda Accord LX

Question type: Maintenance & Repair

When I have the A/C turned on the fans behind the radiator ( 2 of them ) both cycle on and off
...repeatedly.  Neither fan stays on for any length of time.  Shouldn't at least one fan stay on
when the A/C is on?  I noticed this when I was in a parking lot waiting for someone because I
kept hearing the fans turning on then off, on then off.  It doesn't matter what temp the A/C is set
at the fans just keep turning on then off.

4 Answers


No they should cycle like that, one fan is for engine cooling the other is for A/C. The A/C fan will start to stay on longer as the pressures rise in the high line for temperature exchange. The other will cycle as engine temps rise and fall.

5 out of 5 people think this is helpful.

The thermostat operates the ac in probably 30 second on off cycles. This is why it would be stopping and starting. Some cars have 2 fans . All cars run hotter with the ac on. You will find, a vehicle with 1 fan, will probably run all the time with the ac on, even from a cold start up.

2 out of 2 people think this is helpful.

My cooling fans are not coming on I turn the heater on and the AC on and they're not coming on my temperature gauge reads above halfway when I put it in park from a drive they go on sometimes both ends I don't know what to do I put new center tell you truth I don't know where all the sensors are at I've been looking under the hood and under the dash

1 out of 1 people think this is helpful.

No idea. If you have 2 fans (some only have one) the a/c fan should come on as soon as you turn the a/c and the ignition on. The cooling fan may never come on, depending how hot the engine is.

1 out of 1 people think this is helpful.

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