2003 evo 8
temp is fine when im driving once i stop temp starts to rise, main an is running but slim fan is not any ideas would help.

 

I believe there is a switch (a coolant temp sensor) that turns the fan on and off - replace it. It's a pretty simple job. This should fix the fan coming on and off... if it doesn't, then you should check out this thread:
https://www.evolutionm.net/forums/ev...an-switch.html

Here is a link to autozone's coolant temp sensor: Autozone

Also, replace your radiator cap. A good seal is important, and the $12 bucks for a new cap is worth the investment if you've seen overheating issues... typically, if you rev on the motor while your stopped, and the temperature DROPS, it's a good sign the radiator cap is bad.

 

Check the radiator cap, thermostat. also is there fluid in the overflow?
Gl

 

It probably your thermostat stuck close! I had the same problem this year i had to order from the dealership since autozone and other didn't have the right one for the evo. Extreme PSI sale it for $22

 

modded or stock?...

When I was in Maryland samething happened to me... had to go to a bigger rad and fan

 

Coolant flow prob. Mine is doing the same thing and am suspecting the thermostat like mentioned earlier. Since mine is a Cali track car im bypassing the thermostat.