Fan switch

[marT350T]

I am going to put a manual override fan switch into my car but will it have to go through a relay or should a heavy duty 25 amp switch do the job?

How many amps would you expect in the circuit for switching on a cooling fan ?

TIA

[marT350T]

Had a quick look round my car and I have tried altering the settings on the ecu for the fan and this does do anything. Looks like the is a temperature switch in the bottom of the rad the must be a bimetallic strip that triggers the fans but theyt do not activate till approx 94 deg c, but this doesnt seem to have a relay in the circuit and I have traced it all the way back to the battery.

[marT350T]

stevieturbo said:

Add a relay, then control this via switch, and your ecu.

Good idea steve .

Cheers