6G Celicas Forums

My last issue with the car.


Engine fans automatically come on when the battery is connected.
The only way to turn them off is to cut the power.

I can pull the relays. I can disconnect the battery. I can disconnect the wiring harness connectors from the fans.

The two fans come on with the key in any position.
I don't see any broken or spliced wires, and the sensors on the engine atleast look good.


Any help would be appreciated.

make sure the coolant temp sensor is plugged in on the bottom of the radiator. most common problem

ya the fans come on automatically if the coolant temp sensor isn't plugged in. It's a good failsafe

That would be the circuit to focus on, maybe the sensor itself is buggered and giving a false positive...try unplugging it and test the resistance on the pins, if you can get at it without removing it

This post has been edited by schmooot: Feb 23, 2011 - 11:04 AM

you have a short wire somewhere, a wire is grounded somewhere and it shouldn't be.




Guys, he says the fans stay on, he has to disconnect the battery to make them stop, or pull the relay, I'm sure he'd take the keys out of the ignition before wanting to try to disconnect the battery. so no, it's not the sensor unplugged, something is shorting.


unless you know how to use a multimeter and are familiar with wiring diagrams, I'd just take it to an expert, if you don't know what you are doing, you can make this worst.

Bottom of the radiator? On the 7AFE, the coolant temp sensor is on the thermostat housing. That sensor is brand new.

I'm thinking the relays might be stuck.

This post has been edited by chriskm: Feb 23, 2011 - 8:56 PM

reading comprehension > me

This post has been edited by nics: Feb 24, 2011 - 4:45 AM