High speed fan switch
Thread Starter
Heel & Toe
Joined: Jan 2009
Posts: 21
Likes: 0
From: Monrovia Ca
High speed fan switch
Hello. l have wired my Parts List Hayden #3647 adjustable fan controller module on my C5 with help from a great article here on the forum. However, it gives instructions on how to wire it to make your low speed fans come on at desired temp and briefly mentions that with additional connection and circuit complexity, one can run the fans at the high speed. But it does not mention or give any other info on how to perform this wiring set up. Can anyone help? Thanks in advance! 
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
It'd be simpler and cleaner to just re-program the PCM for the fan operating temperatures you want instead of messing with that silly controller and hacking up the wiring on your car.
If you really want to keep messing with it, you need to energize 2 relays in the underhood fuse block to get high speed. There is a signal wire from the PCM that commands high speed and you will have to ground that wire yourself to make this happen. Otherwise, you'll have to remove the stock relays and just wire the controller to both fan motors.
If you really want to keep messing with it, you need to energize 2 relays in the underhood fuse block to get high speed. There is a signal wire from the PCM that commands high speed and you will have to ground that wire yourself to make this happen. Otherwise, you'll have to remove the stock relays and just wire the controller to both fan motors.
Tech Contributor
Joined: May 2008
Posts: 3,100
Likes: 17
From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Your profile lists your Corvette as a 2009, which is a C6.
You would probably receive more specific answers to your question by posting in the C6 Tech section of the forum.
You would probably receive more specific answers to your question by posting in the C6 Tech section of the forum.
