coolant fan switch help
Thread Starter
Instructor
Joined: Dec 2009
Posts: 124
Likes: 0
From: glens falls ny
coolant fan switch help
Bought an aux coolant fan switch for my 84. It came with the switch and pig tail, i was just wondering if anyone could explain how to wire it and what relay to use so it will turn on and shut off with the car.
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Most vendors who sell that package either include the instructions with the kit or have access on a website for the install. Whose kit did you buy and what are the temps advertised. Temp might be cast in the element of the switch. Since you've asked you might want to confirm the operation temperatures of the switch using water of the specified temperatures. It's not unusual for there to be a great deviation of advertised to actual.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
What is the intended use of the sw??
Does your Vette have two fans?
If a new installation and you will still use the main fan control, you will need:
- a relay same as main fan relay will do
- a fusable link, same as main fan uses
- cable & connectors
Does your Vette have two fans?
If a new installation and you will still use the main fan control, you will need:
- a relay same as main fan relay will do
- a fusable link, same as main fan uses
- cable & connectors
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
The relay for the radiator fan is located on the inside of the fender well, just below the brake master cylinder. By running a wire from the dark green/white at the relay, to your new toggle switch, and the other side of the switch to a good ground connection, you can turn on the fan whenever you want. The fan will go off when you turn off the ignition.
Personally, I don't see any use for this switch. I'd rather let the engine Coolant Temperature Switch (CTS) turn the fan on at the proper temperature. If your CTS turns on the fan at a too high temperature, lower temperature switches are available. Mid America Motorworks has one, p/n 09-106 for $20 that turns the fan on at 200 deg. As you may know, the CTS in your '84 is located in the right (passenger) side head, between plugs 6 and 8.
If the fan is turning on okay, and your engine is still running too hot, the new switch won't help anything.
Last edited by Hot Rod Roy; Apr 28, 2014 at 12:55 AM.
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
