Car is not overheating and temp gauge stays in normal range. I just happened to notice today when I got home from work that the drivers side radiator fan wasn't on when the car was still running. Passenger side, which I believe is the AC condenser fan, kicks on and off as you would expect with AC running.

Guessing the drivers side should be constantly spinning while engine is hot and running, correct? I can manually take a screw driver and get the driver's side to start spinning but it doesn't appear to go full speed.

Wanted to swap the relays, but not clear as to what they are. From what I can tell, they are the 2 green relays??

Did you check the fuses?

Maybe thermostatically controlled. Would not surprise me if it didn't need to run with mild ambient temps. The only weird thing is the bit about manually starting it and it staying on? Try pulling the relay out. I found on my track car if I pull the AC relay out both fans run full speed.

If you spin the fan and it automatically starts to work it is normally a sign of a bad fan motor

Roger350 said:

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Maybe thermostatically controlled. Would not surprise me if it didn't need to run with mild ambient temps. The only weird thing is the bit about manually starting it and it staying on? Try pulling the relay out. I found on my track car if I pull the AC relay out both fans run full speed.

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I'll check fuses when I get off work today. I'm not sure if there are 2 fuses if I have 2 separate fans?

And yes, to your point about it possibly being thermostatically controlled..... That's what I'm wondering as well. I can't get a clear consensus online if both fans are supposed to be running consistently. I would assume with my air conditioning on that the condenser fan would operate, which it does fine, but I'm not sure if the radiator fan should also run when the AC is on.

I just want to make sure things are good before the hot weather gets here because I don't want to run into scenario where it overheats.

I'll try pulling the relay and seeing if that does anything. If anything, I guess getting replacement fuses and relays is a cheap first try and fixing the problem.

I doubt both fans are supposed to run full-time just because of the AC. The condensor fan sounds like it is working properly, and I suspect the radiator fan only runs based on the thermostatically controlled temp programmed in the ECU.

But the other poster above saying manually starting a fan that keeps it running is a sign of a bad fan sounds reasonable, I just don't know.

If pulling the AC relay with the AC on full blast makes both fans spin full speed I would assume all is working properly. But if that doesn't work it may not be confirmation that you have a problem either. Your Honda could be wired differently than my Mitsubishi.

Sorry didn't see the picture before, the fuse box map should be on the back of the cover to tell you which is which. It is also in your owner's manual, but it should be printed inside the cover to tell you which is which.

Update:

Didn't see any issue with fuses. When I pulled the fan relay, the condenser fan stopped working almost immediately. Not sure if that means anything. Radiator side fan stayed off regardless.

However, I'm pretty sure I've got a bad fan motor on the driver's side radiator fan. I can continually get it to spin with I manually start it up....and it will continue to spin in sequence with the condenser fan whenever the AC is on. As soon as I turn car off and on again, same thing happens. Radiator fan won't turn on when AC runs until I manually get it started and then it's fine. It also does seem to spin at a slower RPM, so that's probably indicative of a failing motor perhaps??

Car is not overheating at all, including in stop-and-go traffic on way home today. Temp outside was only 80 so I'm sure that helped

Sorry, my instructions on the relay may not have been clear, and my car is 300 miles away and I cannot confirm how it works on mine. But it is not a fan relay you should pull. The AC relay is what I pull in my car and then have the AC on full blast. From my recollection, pulling the AC relay stops the compressor from coming on but forces both my fans to run. I discovered it when I was trouble shooting a problem similar to yours with the radiator fan. I had upgraded to a much larger all aluminum radiator, and at idle the car never got hot enough to make the radiator fan come on, so I was spooked and started screwing around. Again, my AC relay and ECU programming may be very different than your Honda.

Hope you figure it out with as little trouble and money as possible.