Radiator Fan driving me nuts - pls help - Drive Accord Honda Forums
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post #1 of 16 Old 04-09-2017, 11:08 AM Thread Starter
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Radiator Fan driving me nuts - pls help

My 2004 V6 Honda Accord has a problem. When I turn off the engine, both fans keep running. This only happens if I engage AC or Heater. If I don't turn on either of them, the fans will not stay on after turning the engine off. I bought three more black generic relays (that goes into the engine fuse box) from Advanced Auto and played musical chairs with all six relays but couldn't point to any working differently. I also inter-changed the green/blue relay with each other to test but no help. The only thing I can temporarily do is remove one of the black relays on the front side (Left/towards passenger side) and drive. Of course, I checked all the fuses and everything looks fine.

With the weather getting warm, any help or direction will be greatly appreciated. Thanks.


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Last edited by trance3; 04-09-2017 at 11:09 AM. Reason: correction
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post #2 of 16 Old 04-09-2017, 11:53 AM
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https://honda-tech.com/how-tos/a/hon...ned-off-376309

You might have gone and applied some troubleshooting other than relays...

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post #3 of 16 Old 04-09-2017, 01:22 PM Thread Starter
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I also have this switch with me. Not sure where it will go. Can I use this in my troubleshooting? I am sorry for asking a dumb question. This (electrical problem) is all new to me and I am often finding myself getting confused with terms.

https://www.amazon.com/Beck-Arnley-2...SFD97F52BE76ZA

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post #4 of 16 Old 04-19-2017, 06:23 PM Thread Starter
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I replaced the temperature sensor, but the problem still persists. I followed the attached link and now want to try replacing the fan timer module but couldn't find it online and not sure where it is in Gen 7. I found contradicting info on its above the fuse panel or behind the glove box.

Any help is appreciated.

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post #5 of 16 Old 04-19-2017, 06:39 PM
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How long do they run for?

Sometimes they'll keep running after you shut off the car and stop a little later.
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post #6 of 16 Old 04-20-2017, 02:45 PM Thread Starter
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Quote:
Originally Posted by salcuta View Post
How long do they run for?

Sometimes they'll keep running after you shut off the car and stop a little later.
Thanks!

To be honest, I never waited for over 5 mins. The reason being, that it never seem to do that before. Once the key is out of ignition, it will be all quiet.

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post #7 of 16 Old 04-20-2017, 03:09 PM
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^ STOP throwing money and parts at your car. There is nothing wrong with it. If you go back out to the car after an hour and the fans are running, you've got a problem. If you wake up in the morning and the fans are still running or have completely killed the battery because they were running at midnight when you went to bed, you have a problem.
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post #8 of 16 Old 04-20-2017, 03:23 PM Thread Starter
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Originally Posted by jimijam View Post
^ STOP throwing money and parts at your car. There is nothing wrong with it. If you go back out to the car after an hour and the fans are running, you've got a problem. If you wake up in the morning and the fans are still running or have completely killed the battery because they were running at midnight when you went to bed, you have a problem.

Alright, JimiJam. I am gonna follow your advise and give it a try for a week. I am not good at all in finding electrical problems in cars. You may need to jimi me out of this jam again.
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post #9 of 16 Old 04-20-2017, 03:32 PM
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^ lol. seriously though. go out and check it at 5, 10, and 15 minutes after you leave it. definitely report back with your results.
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post #10 of 16 Old 04-20-2017, 03:39 PM
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A lot of issues with fans running after the car is turned off turn out to be low coolant or an air bubble in the cooling system. Does the car fun hotter than normal?

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post #11 of 16 Old 04-20-2017, 03:42 PM Thread Starter
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Originally Posted by greg1c View Post
A lot of issues with fans running after the car is turned off turn out to be low coolant or an air bubble in the cooling system. Does the car fun hotter than normal?

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I noticed my coolant was little low, but I took care of it when recently I did drain and fill. The fan continue to run after the coolant level was normalized. The "idiot guage" on the car seems to be a little over quarter temp, which has been normal as far I remember. I may connect my obdII scanner and leave it on to see exact temp when I am commuting.

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post #12 of 16 Old 04-20-2017, 03:54 PM
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^checking it during commutes may not tell the "rest of the story". highway driving = less fans need to work to keep temp under control. driving slow, up hills, in traffic around town on a hot day in Guam = more fans need to work. Coming off the highway and driving slow through the hood right before you shut the car off means those fans are going to be kicking on.
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post #13 of 16 Old 04-20-2017, 05:02 PM
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It is possible you have a bad radiator fan switch (temperature), that switch is designed to close at 199 degrees Fahrenheit. If that sensor is "sticky" or is not reading correctly or is reading correctly the fans can run without the car being on. The only other thing(s) that can turn on the fan at anytime is the AC and the ECM/PCM.

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post #14 of 16 Old 04-20-2017, 10:42 PM Thread Starter
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Quote:
Originally Posted by greg1c View Post
It is possible you have a bad radiator fan switch (temperature), that switch is designed to close at 199 degrees Fahrenheit. If that sensor is "sticky" or is not reading correctly or is reading correctly the fans can run without the car being on. The only other thing(s) that can turn on the fan at anytime is the AC and the ECM/PCM.

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I will take a look at that too. Can you tell me where is the location for radiator fan switch is and if you have the link handy for the part on Amazon?

I am also giving a shot at JimiJam's suggestion and will report back too.

Thanks!

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post #15 of 16 Old 04-21-2017, 05:01 AM
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Can you tell me where is the location for radiator fan switch is and if you have the link handy for the part on Amazon?
Here is the switch location; but as said - I would not just buy and start replacing stuff.

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