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Guest Message by DevFuse

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How to wire rad fan when connector is gone?

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2 replies to this topic

#1 LostWater


    Looking for 80-87 Hatch

  • Members
  • 327 posts
  • Myersville, MD

Posted 29 February 2004 - 07:41 PM

Hey all,

My connector that hooks to the rad fan is gone, or, I don't know what to do with connector that is just flapping along. Right now, I have the fan hooked directly into a connector hanging down there, so it is on all the time the ignition is on.

Question is: I want to use the thermo switch in the rad to turn fan off and on. Where should I pull a power lead from; which connectors on the thermo switch are what? I know that the thermo switch closes a circuit when it is warm enough, so that part should be easy. I just need to know which lead on the thermo switch is in, which is out. And, of course, where should I pull a hot wire to power the works?

I hope this made sense?

Thanks a bunch,

#2 Skip


    Flatuous Blather

  • Moderator
  • 8,991 posts
  • Latrobe, Pennsylvania

Posted 29 February 2004 - 08:24 PM

Mark since you have the fan running
you have your hot feed already.
Use a test light to find out which one it is.

The thermoswitch is in the rad, has one single pin
(you do not say so I'm guessing EA81 Hatch??)

This single pin goes to ground
when the thermno switch closes.

The one wire that is the hot feed is left connected
to one wire on the fan.

The other wire to the fan
goes to the pin on the thermoswitch.

The rad must have a ground strap to the core support.

Hope this explains it well enough.

If you want to add a relay (recommended)
please email me

#3 LostWater


    Looking for 80-87 Hatch

  • Members
  • 327 posts
  • Myersville, MD

Posted 01 March 2004 - 08:43 AM

Hey Skip, thanks so much for the response.

I have an aluminum ea-82 radiator installed in place of the slimy green copper one that I pulled out of it sometime ago. The thermo switch on it appears to have two leads coming out of it. One is perpendiciular to the other. Maybe I should pull that out and install the one from an ea-81? I hope that you might know the wiring sequence for hooking the two lead ea-82 one up though.

I was thinking of hooking the fan (likely two at some point) to a relay with an override toggle in the dash (for water crossings and such), the relay being required if I were to tap off of the battery I assume.

With the fan running all the time now, and that bigger al rad, My ea-81 hatch didn't warm up on the drive to work this morning. (22 miles, 35 minutes), barely enough to blow some heat.

Again, thanks for the help,


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