So I bought this 1995 EJ1 Coupe about 2 months ago and it has been working great since, but recently my area has started to see record high temperatures of 100 degrees F. or more. A couple days ago, I was driving around and trying to climb a hill when I looked at the temp. gauge and it was all the way on "H". I started wondering what was causing it, and after some time I realized it wasn't my radiator or low coolant, but that my radiator fan would never turn on no matter how hot my car would get. So yesterday I tested my radiator fan by hooking it up right to the battery and the fan worked fine. Next, I checked the relay by swapping it out with a new one and it made absolutely no difference. From reading other similar posts, I think that it's my thermostat that is bad, but I'm not sure exactly where it is. In the pictures below I have circled where I think it is, but I just wanted to make sure. Also, if the circled item is the thermostat, how do I get it out easily considering the bolts are really hard to get to? Lastly, if you think it's something else, please let me know as well. Thanks for any help you can provide.

 

bump?

 

you could always just jump the fan to where it comes on everytime you turn the key over, that would be a quick solution, the thermostat thing... you will have to unbolt those 10mm bolts and swap the thermostat out. If you dunno how to jump the fan and you want to do it, let me know...

 

It's the cooling fan switch, common problem. The switch has a sensor that determines coolant temp, and switches the relay on and off at preset temperatures. Don't confuse it with the coolant temp sender, which sends the coolant temp to the ECU. The switch can be bought at Autozone/Advance for fairly cheap and can be installed in minutes. Don't forget teflon tape.
The thermostat does not affect fan operation. It pops open at a preset temp, redirecting coolant to the radiator.

 

You could do that but it's ghetto and introduces new wires to the system. If not done right he'll have future problems on his hands. Besides, the switch is cheap and easy to replace.

 

Thanks for the replies guys. Where's the cooling fan switch located?

 

Same thing happened to me. The Switch is in the 1st Picture, bottom left corner. There should be a Black and a Blue Wire? Or was it a Brown and Black Wire? Anyways, The Black Wire is the ground, and the other wire is the Power.

I ran a toggle switch to mine, just wire up a switch, 1 Wire Ground, 1 Wire goes into the Fuse Panel, and the other wire gets spliced into the Radiators Switch's Postive Wire, which is the non black wire.

Just flip the switch on or off whenever you want to run the radiator. It also dressed up my interior better.

Hope this helps.

 

Thanks for explaining, but I'm just wondering if the cooling fan switch that everyone's talking about is found by following the power connector wires from the radiator or where it exactly is, because that's all that I can see in the lower left of my first picture that looks like it would have anything to do with the coolant/radiator.

 

If you follow the wires from the radiator fan, it will go into the underhood fuse box.
From the underhood fusebox will run wires to the Thermostat Fan Switch located near the Thermostat.

I have this problem as well and hardwired it but it is an easy solution by replacing it (cheap part from local auto parts store or even finding a working sensor from the junkyard).

To test sensor, you can hover the sensor over boiling water and hook up a multimeter to the prong connections and see the OHM resistance change.

 

try checking the electrical

 

So I think I found it, but my question is if I have to undo that bronze bolt to get to the sensor or if the plug just needs to be replaced?

 

bump

 

you can test it by jumping the plug, the sensor itself has to be replaced. That bronze piece is part of the sensor

 

ok thanks

 

just put a paper clip on the harness side of the thermostat fan switch from pin to pin. make sure key on engine off. if fans come on, that tells you fan switch is problem.