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

5

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.

9 Answers

105,385

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.

7 of 7 people found this 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.

3 of 3 people found this helpful.
30

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

3 of 3 people found this 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 of 1 people found this helpful.
60

I have same issue I'm driving Honda Accord 2003 model. 2.4ltr 4 cylinder. I had one fan which readaitor fan bad another A fan was working properly..radiator fan was not working anymore. I tested found readitor fan motor is bad. I went junk yard I asked with guy same brand same motor . and he installed that I thought I have Done the issued clear. but when I was driving back home and about 10 min of drive I got overheat sign. AC was on. But temperature was increasing second by second. I open that hood and I notice when I on the AC both fan was running in same time and off for 2 second same time again running in same time. before I never noticed that. I thought it would be lot of pressure in engine therefore the temperature was increased when I drive with AC on but I'm still not sure. I have no idea that both fan runs together and shut together for while and again starts together .. anyone please advise me of you came up with same issue ? thanks

6 of 6 people found this helpful.
20

I tested the cooling fan on my 2005 Honda Accord (it has two fans)- And it was bad - changed two fan assembly (got new denso for 40$ dealer wanted 800$)- Still didn't spin so changed cooling fan relay and now works great. FYI when a/c on both run and when temp goes up both run I haven't experienced either shutting off independent of the other. i believe relay was original failure leading to premature fan failure from never shutting off which lead to higher heat which in turn affected a leak at water valve which I also replaced along with new hoses. Glad I caught it in time , heat didn't seem to go high enough or long enough to cause any thing else yet - right yet !

1 of 1 people found this helpful.
30

I have a 2009 Honda accord 2.4l I have 2 fans but only one comes on when a/c is on. the other does not come on or I haven't gotten to get it to come on I put direct power to it and it came on. so I have no clue whats going on also car sometimes over heats so any help on what to look for

3 of 3 people found this helpful.

to nonvtec: One fan is for A/C, and the other for radiator. For the radiator fan, there is a relay and a fuse. You may want to check those. You can visually check the fuse. As for the relay, I would swap the radiator relay with the A/C relay (they are the same on 2007 Accord). If the A/C fan still comes on, then it is not the relay. One last piece would be the thermostat.

30

My A/c is off and for some reason both fans come on and turn off..I'm noticing less gas mileage too???

3 of 3 people found this helpful.

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