I believe my coolant temperature sensor is bad, because my coolant gauge is broken (showing temp on max overheated), in tESt mode my actual coolant temp is -048 after driving, and neither of the radiator fans come on. When checking my coolant, I found it to look like chocolate milk and smell like vomit. Typical oil in the coolant. I'm afraid this will cause a new coolant temperature sensor to go bad really fast, so I just want to hook up my radiator fans to a manual dial or switch. This is pretty much a stripped down track car anyway, so how would I go about doing this? Has anyone done this before?

 

Fixing the..."oil in the coolant" situation would be my first step.
Second would be a properly working sensor.

Mike

 

Should be easy enough. Just route a wire from the battery to the fan with a switch in the middle... but yeah... the oil in the coolant is a bigger of the two problems...

 

Rad fans have a main relay .. run a powered switch to the relay input where it gets signal now. (would be where i would start). Or ditch/leave the relay alone and just run your own power/15A fuse/swtich - either way.. the thermostat/AC/ECU will never be able to trigger the fans.. so just make sure youre OK with that.

 

As a track day car, I'd say fixing the "chocolate milk coolant" problem would be first priority before the engine grenades, pukes its guts all over the track and sends the guy behind you into the weeds. Oil in the coolant is never "typical".