Hi guys. I'm trying to find an answer to this. I'd appreciate any help.

It only comes on when I turn the AC on. What's happening when I engage the AC is that both the radiator fan and AC fan come on and run. When I turn AC off, both fans shut off.

So because of this I've ruled out the motor is not bad since it works when AC is on.

What is my next step?

2003 Accord 2.4


Thanks!

 

The radiator-fan switch is located in the lower tank of the radiator. I think it's the only thing down there with a wiring plug. Unplug that & jumper the wires with a paperclip or short piece of wire.

Key on, that should make both fans run. If that's OK, then there's 2 things to think about...

- Bad fan switch.

- How cold is it where you live? During winter I have a very hard time getting the fans to run. I almost have to put a blanket over the radiator. As long as you're driving 10mph or more, there's plenty of air being pushed thru the radiator anyway, and the fans normally won't run.

 

With ac on both fans run.

Your only possible problem you have is if one doesn't run when the motor temp gets above 190.

 

Ya, I was looking at the switch yesterday and one of the 2 wires leading into the plug was completely broken and the other was frayed. When I touched the 2 wires together the fans came on.

 

So a good splicing job on those wires is probably all you need to do.

 

The problem now is that where the wire broke, it's like 2 millimeters from the plug. Does anyone know if that plug can be taken apart? I went to Honda dealer today. They don't sell...they want to sell the entire wiring harness for 600 bucks. Napa-no, Autozone-no, Checker-no. I have one other option, an import car shop, and then I'll be searching the junkyards.

 

The plug can be taken apart. There is a white plastic piece inside of the plug that can be pulled out. You need a pin or hair clip to release the metal locking mechanism of the pin, and pull it from the back of the connector.

Hope this makes sense.

Here is a video explaining how to release the tab.

 

The 2P radiator fan gray connector doesn't have what Honda calls a secondary lock (e.g, depending on connector style; plastic piece to pull out, flip up/down, etc.).

Honda doesn't show terminal replacement instructions for that type of connector for the radiator fan switch. But, most pins can still be released with a pin tool and pushed or pulled out the back.

In regards to the Honda harness, it is part of the front engine harness, and retails for approximately +/- $110, pricing varies depending on trim level. It is approximately +/- $80 plus shipping at online dealer. Less if used.

 

Although that radiator fan connector type is not part of this link, this shows Honda's electrical connector terminal replacement procedures.

Honda Electrical Connector Terminal Replacement Procedures