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Old 06-04-2003, 07:26 AM
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Post fan relay

does anybody how the wiring goes on a fan relay. the relay has four connectors in the bottom how does this wire up? please help
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Old 06-04-2003, 07:41 AM
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Usually 2 are power and 2 are the contacts to turn the fan on. You didn't say what style relay it is. If it's a bosch style I have a diagram if not you'll need a volt/ohm meter to ring out the curcuit

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Mark
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Old 06-04-2003, 09:25 AM
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Yo, Jag daddy, can you send me a pm with a copy of this secamatic? Thanks
Slider in Wa.
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Old 06-05-2003, 04:23 AM
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Bad and Slider, several months ago, either Kevin, Turbo S10 or Willys 36 posted some neat wiring schematics that included electric fan hookuops. I copied thes to file and they have all been handy. Unfortunately, the way I copied them left out the thread info. If you search back several months, you will find them or send me a PM with your e address and I will send you a copy of my file.

Trees
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Old 06-05-2003, 04:58 AM
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hey man if you go to
www.producteng.com
they have a neat fan/fuel pump wiring chart ( or it maybe only fuel) anyway you can get an idea from them to have your wiring needs to go. I bought their wiring fuel pump relay kit not bad 42.00 for all the relays and already assembled with the wires and all.

just my 2 cents hope it works.
Thanks
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Old 06-05-2003, 09:58 AM
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Relay info

Cheap and dirty cooling fans - I think the temperature switches have come down in price, so you might be just as well off checking somewhere like SUmmit or Jegs for that instead of the water heater switch.

As for your relay, if you have terminals marked 30, 85, 86, 87 and 87a (some don't have 87a and you won't use it for this application) then it's what's called a BOSCH relay. That's only the type of relay, not necessarily the MFGR so it likely won't even say Bosch on it. Relays take the load off of the switch you use to turn the fan off and extend their life.

85 and 86 are your switches - power to one and ground to the other will close the contacts inside and connect 87 and 30. It doesn't matter if you hook your fan to 87 or 30, as long as the battery is hooked up to the other side. Use an inline fuse within a foot of the battery. For reference, 30 and 87a are closed when there is no power across 85 and 86.

Last edited by Stinkin_V8; 06-11-2003 at 11:05 AM.
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Old 06-07-2003, 07:28 PM
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I took a look at his schematics for the fan cooling system, the biggest problem I found was using that thermostat the fans will come on even if the car is just sitting. He needs to dump the tremostat for a themal switch plumbed into the cooling system. On a hot day those under hood temps could have that fan running ALL the time. Oh and he said he used a fan from a Citation, it's probibly woefully to small in the CFM department

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Mark
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Old 06-10-2003, 03:45 PM
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To wire the relay:
87-To (elec.fan,elec. fuel pump,elec.water pump,etc).
86-To switch that turns the relay on.(12 volt)
85-To ground.
30-To constant battery power.(12 volt)
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Old 06-11-2003, 10:59 AM
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Jag Daddy,

The only way the fan would run when the engine's not running is if you just parked it and the engine was still warm. I've heard that this is better for the engine rather than letting it cool just by sitting there. It should only run for a few minutes after the vehicle is shut off, but I still don't like the idea of a fan drawing up to 55 amps (depending on the fan, of course) when I walk away from the vehicle. You could just change the +12V input from the battery to a +12V ACC or IGN line and it would only run when the key is on.

As for fans, I like the '96 Taurus. It used a 2-speed fan - one speed can go to the thermal switch and the other speed can be triggered by the AC compressor.

Last edited by Stinkin_V8; 06-11-2003 at 11:25 AM.
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Old 06-18-2003, 10:18 PM
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I'm using 2001 T/A fans for my '79 El Camino with a somewhat modified 355, stock water pump, and aluminum radiator. It ran 2000-2500 rpm sitting in the garage for about 20minutes and never got past 180 degrees. The fans really kick.
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Old 06-19-2003, 02:50 AM
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Quote:
The only way the fan would run when the engine's not running is if you just parked it and the engine was still warm. I've heard that this is better for the engine rather than letting it cool just by sitting there. It should only run for a few minutes after the vehicle is shut off, but I still don't like the idea of a fan drawing up to 55 amps (depending on the fan, of course) when I walk away from the vehicle. You could just change the +12V input from the battery to a +12V ACC or IGN line and it would only run when the key is on.
I use a cheap 12V timer circuit to run the fan for 2 minutes after shutdown. Auto switch off after 2 minutes. Works well.
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