My radiator fan has gone crazy!
When I turn my key to "on", the radiator comes on, even when the engine is cold. It doesn't stay at one speed. It spins at full power for 2 seconds and then slowly for 1 seconds, stop for 2 second, max power for 3 second, slowly for 2 second, stop for 1 second... totally erratic.
When the engine is warmed up, everything seem normal again, no overheating.

Is it the fan controller? Coolent temp sensor? Fan relay? ECU? Any idea please?

 

I had problems with my cooling fan working like crazy after warmed up, it simply didn't stop. The culprit: Fan controller module!!!

There is a recall on the fan controller module for 2003 Evo 8.

 

hope this helps out. mitsu did a recall on all 03 evos for a fan controller. that may be y they did it. i dont no. also not shore of 04 and 05. but cant hurt to ask them.

 

I went auto xing today, letting the turbo cool down without shutting the car off after a run the engine temp went up. Well after shutting it off the coolant was boiling out so I turned the car back on, turned on the heater/ac at full blast. The temp didn't drop at all. None of the fans would go on when the ac/heater was on. The car twitched like it would turn on but I didn't notice the fans operating. When I turn the car off the front radiator fan kicks on but that's the only time. The white fan behind the radiator just sits there.

My car is a 2003, i've searched for the recall and think I found the right number. Does anyone know if they will fix it since I've got the AEM EMS in the car now. I also have the temp sensor running into an autometer gauage. I got the car home safely. Driving it cooled it back down to 180, the needle was pegged at 250 when the coolant was boiling.

Pete