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
 

Photo
- - - - -

Fan problem: need help understanding what is wrong


  • Please log in to reply
2 replies to this topic

#1 lepetitprince

lepetitprince

    USMB Irregular

  • Members
  • 384 posts
  • Madison Heights

Posted 26 June 2004 - 01:34 AM

Hi all. I have 82 Brat, I guess its special year and manufacture did some funky things to it. I have two fans, one of the connects to thermoswitch, and the other was connected to thermoswitch but never got it to work. Even with all those tactics we know for 82 Brat. With headlight off, a/c on or off, all those things, I never got it to work. So I decided to hard wire it. With little switch the fan works even the engine is not on. So assuming both of the fan will work, one day when engine was hot, I checked under the hood, guess what, only hardwired one was working. Found out later that wire wasn't connect to the thermoswitch. Soon after I connected back the wire into the thermoswitch, hardwired fan stopped working. So I pulled out the wire from the thermoswitch. played with hardwired fan, and got it to work again(caused my half of my fingernail from my ring finger); pull out the fan wire from the thermoswitch and played with switch on the hardwired fan, and when it was working, I plugged back in the fan wire into the thermoswitch. Today I installed new thermoswitch, plugged in the fan wire, and now guess what, my hardwired fan doesn't work. What I dont understand is that, my hardwired fan has its own relay, so I don't think there ins't any limitation of when should the fan work or not, but everytime, a wire from the other fan is connected to the thermoswitch, the hardwired fan doesn't work, and vice verse, when hard wired fan is working, the other fan that is connected to thermoswitch doesnt work even at its specific engine temperature. I would like to understand why this is happening. And thank you in advance, and sorry for confusing questions and explanation.
Thanks
Dan

#2 canajun2eh

canajun2eh

    USMB is life!

  • Members
  • 222 posts
  • Ottawa, ON, Canada

Posted 26 June 2004 - 06:27 AM

I suspect that you have the wrong kind of relay. From your description, it would appear that the relay is the "normally closed" kind. This means that the contacts are closed until the coil is energized, at which time the contacts open.

You need a relay in which the contacts are open until the coil is energized. If you've bought a relay from an electronics store, you may simply have used the wrong pair of contacts -- most electronics relays are double-throw.

Why don't you just wire the two fans in parallel, and forget the second relay? I think you'll find that the first fan is already being run through a relay, and that the relay should be able to take the load of the second fan. If your fan fuse blows when things are wired this way, you'll need to add the second relay with its own supply and fuse. Don't install a bigger fuse.

When you use a second relay, run the two coil wires to the first fan so that the relay will turn on and off at the same time as the first fan. Don't try to control the relay directly from the thermoswitch.

#3 edrach

edrach

    Charter member OFRT

  • Members
  • 12,324 posts
  • Bothell, WA

Posted 26 June 2004 - 09:40 AM

Dan, simplisticly I think you have a bad ground somewhere that is creating your fans' "odd" behavior. However, if you research the Board a bit, I think you'll find a suggested wiring diagram for getting both fans to work. Sometimes it's easier to just re-do something than to try and figure out what's wrong.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users