Evo 5 rad fans wont cut out

[joey]

Engine light came on today so checked faults and bought up code 21 coolant temp sensor,the 2 fans were running to when i got home

Fitted a new sensor,reset the ecu.Started car no light on and fans were off.
Went for a short spin for less than 5 mins and fans were on when got home and wouldn't cut out while engine running.went for another spin but fans still on.turned on and off car few times but when car is restarted they cut in straight away.no fans working with just ignition turned on

Temperture gauge reading normal.

Leave car cool down,start it and fans are off but after about a min fans cut in and stay on.

Also removed the wire off the coolant temp sensor while fans are running but they stay on.

Car ie an Evo 5

any ideas whats wrong?faulty switch?

 

[fq-craigus]

Thermostat? Only idea I got mate

 

[4g638]

Check the fan controller (black box next to the fan), it is most likely knackered.


Also check water temp sensor on the thermostat housing. Check resistance on it should be around 4k Ohms.




Marios

 

[joey]

Check the fan controller (black box next to the fan), it is most likely knackered.


Also check water temp sensor on the thermostat housing. Check resistance on it should be around 4k Ohms.




Marios

thanks lads,is that the black box with 4 heavy wires coming out of it clipped on to the top of the fan cowling?whats the best way to check it?

i fitted a new water temp sensor today but im thiking its faulty so trying another one tomorrow

 

[4g638]

thanks lads,is that the black box with 4 heavy wires coming out of it clipped on to the top of the fan cowling?whats the best way to check it?

i fitted a new water temp sensor today but im thiking its faulty so trying another one tomorrow

Yes that is the one, best way to check it to replace it with another and see if it makes a difference, which I believe it will.





Marios

 

[joey]

thanks,i'll try find one tomorrow

 

[joey]

was just having a look there and think its only the 7 8 9 had fan controllers?i could be wrong though

 

[4g638]

was just having a look there and think its only the 7 8 9 had fan controllers?i could be wrong though

Your are not wrong the 4/5/6 do not have a fan controller, I just did not see that you have an evo 5. Check the sensor and let me know.





Marios

 

[joey]

Fitted another new water temp sensor this morning and fan now is cutting in and out as normal.
thanks for the help