Jump to content

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse

- - - - -

1986 XT Turbo 4WD electric radiator fan switch

  • Please log in to reply
2 replies to this topic

#1 Mr. Carb

Mr. Carb

    Weather Geek

  • Members
  • 903 posts
  • Everett, WA

Posted 24 February 2018 - 06:47 PM

Had a difficult time finding any information by searching.  Does anyone happen to know how the circuit for the electric radiator fan in the 86 XT Turbo works? There is a 2 pin connector and 2 pin radiator fan switch, which was replaced but still doesn't work. Trying to figure out how to test the circuit, since the switch is 2 prongs, instead of a single prong grounding switch ea81's have.  I know it's more complicated because there is A/C which also is supposed to turn on the cooling fan, correct?

#2 john in KY

john in KY

    1000+ Super USER!

  • Members
  • 1,653 posts
  • KY

Posted 24 February 2018 - 07:59 PM

I know it's more complicated because there is A/C which also is supposed to turn on the cooling fan, correct?




Has to be a relay somewhere that could be the source of the problem.  Thinking from memory there should be 2 relays on the passenger side, close to the strut.  From memory, one is for the fan.

#3 Gloyale


    It's a sickness

  • Members
  • 10,698 posts
  • Corvallis, OR PNW

Posted 24 February 2018 - 09:46 PM

12v positive to ones side of the fan.


Switch connects to ground.


A/C relay shouldn't have anything to do with it.  It grounds the Fan wire parallel to the switch.  So the Thermos switch or the A/C relay can ground the fan to turn it on.


You need to test for 12+ on one of the fan wires.


Test for Ground at one of the 2 wires for switch.


Then test if switch is closing when hot.

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users