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Old 01-13-2019, 09:55 AM   #21 (permalink)
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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.

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Old 02-28-2019, 05:54 AM   #22 (permalink)
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Originally Posted by bruno View Post
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.
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Old 02-28-2019, 06:34 AM   #23 (permalink)
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I am working on this.

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

Ill post some updates.
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Old 02-28-2019, 10:59 AM   #24 (permalink)
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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
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Old 03-06-2019, 11:40 AM   #25 (permalink)
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Originally Posted by Ecky View Post
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.

See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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