Cooling fan on/off

[Keito]

You don't need to power the fan to turn it on, you can simply ground the fan relay
via a switch in the cabin if you want a manually turn it on and off.
I've added a manual fan switch to a few cars I race at the track.

On my 2017 Ford Fusion it does throw a "soft code" when I scan the PCM but
has never thrown the check engine light.

[Ecky]

Originally Posted by bruno

I want to disable the fan and spray water on the radiator.

My advice would be to leave the fan's control in place, and to have a water jet that comes on at a lower temperature. So long as the water is functioning, the fan should never come on.

[teoman]

I am working on this.

It will take a lot of time for me, but ill get it done.

Ill post some updates.

[Piotrsko]

Probably the fastest way to mod this is get a different temp sensor. Afaik, there is no actual requirement to test coolant temps for smog compliance, only to ensure that at some temperature the engine is effcient and in closed loop. A higher temp thermostat might work, but I am unsure of that concept in practice

Hopefully you dont have to take the front of the car off to change it like my old ford focus

[California98Civic]

Originally Posted by Ecky

My advice would be to leave the fan's control in place, and to have a water jet that comes on at a lower temperature. So long as the water is functioning, the fan should never come on.

Yeah. I think this is good advice. When you run out of water in a place where you can't get any more, you will want that computer to turn that fan on automatically. Seems like a good redundancy.