Close



Results 1 to 8 of 8
  1. #1
    FEP Senior Member 83gt351w's Avatar
    Join Date
    Nov 2014
    Location
    Grand Rapids, Mi
    Posts
    654

    Default DIY electric fan controller

    After researching fan controllers, I’ve decided against spending 200 bucks on one. So I went to the junk yard, and pulled a temp switch out of a mid 90’s BMW, which was located on the pass side of the radiator. I also pulled a 2 spd fan relay out of a mid 90’s Volvo which is located under the pass side headlight. Then I tapped my thermostat housing to accept the temp switch, which is a 14mm x 1.5. Follow along as I attempt to get this baby working. Name:  3AE5D567-8FCB-4C0D-A246-F4B92FC3F1D2.jpg
Views: 473
Size:  113.3 KBName:  7CEEC0FF-45FC-47FA-B27F-4FF59C914CB9.jpg
Views: 456
Size:  83.3 KBName:  128087C6-206B-4F79-9D3D-E1A65CAF0445.jpg
Views: 429
Size:  80.8 KB

  2. #2
    FEP Super Member erratic50's Avatar
    Join Date
    Dec 2016
    Location
    Nebraska
    Posts
    4,575

    Default

    Nice -- what fans do you plan to run?

  3. #3
    FEP Senior Member 83gt351w's Avatar
    Join Date
    Nov 2014
    Location
    Grand Rapids, Mi
    Posts
    654

    Default

    Sorry, this is for my 2 spd Mark Vlll fan.

  4. #4

    Default

    I did this same thing for my '84 capri. I used the fan from the same volvo I got the relays from. Since the volvo fan can removed from its shroud I was able to mount it inside my stock shroud. It works great, just wire it so it turns off with the ignition otherwise it will continue to run and run your battery down.

  5. #5
    FEP Power Member Ourobos's Avatar
    Join Date
    Apr 2008
    Location
    Waikoloa , Hawaii
    Posts
    1,879

    Default

    I personally would put the switch where the stock gauge sender is, and move the gauge send to the thermostat housing, otherwise this will not read the correct temperature when the thermostat is closed. Nice find though.
    1986 CHP SSP Coupe

  6. #6

    Default

    I run the Contour dual fans with two of the Volvo fan controllers, one for each fan, and the BMW temp switch in the radiator where the drain valve was.
    Wired constant hot, works great. It shuts off after about 30 seconds or less after the car is turned off.
    1978 Mercury Zephyr boxtop 5.0 EFI T5Z 8.8
    1999 Ford Contour 2.5 V6 5 speed
    2016 Ford Focus ST 2.0 Ecoboost 6 speed

  7. #7
    FEP Senior Member 83gt351w's Avatar
    Join Date
    Nov 2014
    Location
    Grand Rapids, Mi
    Posts
    654

    Default

    Quote Originally Posted by Ourobos View Post
    I personally would put the switch where the stock gauge sender is, and move the gauge send to the thermostat housing, otherwise this will not read the correct temperature when the thermostat is closed. Nice find though.
    This is where all the confusion sets in. I see all these switches that they tell you to mount it on an intake bolt, or the head. My thought was I’m monitoring the coolant temp coming out of the engine, and when it reaches a certain point, the fan kicks on. Has anyone had success in the t stat housing?

  8. #8
    FEP Power Member Ourobos's Avatar
    Join Date
    Apr 2008
    Location
    Waikoloa , Hawaii
    Posts
    1,879

    Default

    Only real difference is you can monitor the temperature BEFORE the thermostat opens - the temperature inside the engine.. If the thermostat sticks closed, you'll never know it by the gauge.... It'll read ambient temperature..
    1986 CHP SSP Coupe

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •