Additional fan control

[Tipo874]

I would like to have an additional way of turning on at least the low speed fan and possibly both fans outside the control of the PCM. What would be the safe way of doing this without risking damage to the PCM? I still want to retain control of the fans via the PCM. Perhaps a grounding of an existing wire? If so, which one? This is in a project car.

Thanks, David

 

[nota4re]

At connector C213 - in front bonnet on passenger side up near the windshield...pin 33 is a Light Green/Yellow Stripe. Give that ground and you will have a low speed fans. Same connector (C213) pin 11 is Light Green/Violet Stripe. Give that ground and you will have high speed fans. You can hook up with a SPDT switch with one leg to ground and the other two legs to these wires. Wiring can be small (16-ga) as these are only relay triggering wires - no high current.

 

[Tipo874]

At connector C213 - in front bonnet on passenger side up near the windshield...pin 33 is a Light Green/Yellow Stripe. Give that ground and you will have a low speed fans. Same connector (C213) pin 11 is Light Green/Violet Stripe. Give that ground and you will have high speed fans. You can hook up with a SPDT switch with one leg to ground and the other two legs to these wires. Wiring can be small (16-ga) as these are only relay triggering wires - no high current.

Thank You! This is exactly what I was looking for.

 

[steved57]

The info that can be here is incredible