Hi I have a 2008 Evo x GSR and I noticed my car has been getting slightly hotter, just above half on the coolant temp gauge. When I drive on the highway the temp goes back down to normal. I have never heard/seen the radiator fan kick on so I think that's my problem. Which relay/fuses should i check? What steps should i take troubleshooting this.

Thanks

 

Have u check the radiator fluid level?

 

I've checked the overflow and its good. but the fan isnt turning on

 

Update!!!! the cooling fan DOES kick on...eventually at 198 degrees but its not strong enough to cool the engine. When i turn the AC on high the cooling fan kicks on very strong and cools then engine. I'm thinking fan control module???

Does anyone have that part number???

 

You checked the overflow, did you check the radiator?

 

turn on your a/c, your radiator fans should turn on. This way you can know if they are working or not.

 

I checked the overflow and radiator. I turned the ac on and the fans do turn on full speed. The fans still don't turn on at idle to cool the car when it's getting hot. Temp gauge goes about 3 clicks over normal

 

Maybe the fan motor is on its way out

 

i would start with the fan.

 

I replaced the coolant temp sensor and no use . The fans work perfectly with the ac on idk why they dont kick on to regulate coolant temp. I had my tuner adjust my fan tables a little lower and it seems to help but it still gets hot.

 

Ok before you go any further, clarify something please. Does the temperature go three clicks above normal and then the fans DO click on? Or does it go three clicks above normal and then you turn it off to prevent it from getting any hotter? There are a couple different systems that control when the fans click on. One, when you turn on the A/C, the fans will usually automatically click on to compensate for the increased engine load and keep the car at proper running temperature (regardless of current temperature). Two, when the car reaches a certain temperature (usually anywhere from 180-220*F) the ECU/ECM will trigger the relay to send power to the fans and cool the car.

Make sure you check the coolant level in the actual RADIATOR, not just the overflow. I think it goes without being said to do this with the engine COLD.

 

The fans do kick on after the car has gotten 3 clicks above normal. Now that I had the fan tables adjusted it just goes up 1 click now. They used to come on at 198 now they are about 187 or so. I have checked coolant in the radiator and there is coolant in there aswell as the overflow. I still drive the car as is but if I do a pull from a stoplight the engine will knock. The car regulates temperature perfectly on the freeway and when I'm moving it eventually cools down

 

Way too complicated! Just replace your thermostat. It's not opening when it should. The reason it cools on the freeway is the air movement.

 

Thermostat would have no influence on WHEN the radiator fans kick on, this is controlled by the ECM/ECU. The thermostat would however influence the car getting hotter quicker or slower. If the temperature gauge is reading hot, unless there is an issue with the temperature sensor, the fans should kick on. (Eg. ECU Programmed to enable fans at 195*F, thermostat is stuck open, car never gets to 195*; fans do not kick on. Thermostat stuck closed, car gets to 195* and continues to heat up, fans kick on at 195* and stay on because temperature doesn't drop below 195*)

If that makes any sense....

Basically the system for the temperature control functions as

FAN ON IF TEMP > OR = XXXX
FAN OFF IF TEMP < OR = XXXX

Most systems will automatically activate fans if A/C is turned on due to increased engine load.

 

The car does regulate temperature like that. They kick on at about 198 and make the temp drop to like 182. So I guess it's doing its job I've just never had a car that had the coolant temperature gauge fluctuate like that