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Old 06-09-2002, 11:04 AM   #1
Edmond
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Question Electric Fan switch location

I have found an switch and I was wondering if I could put
it in on the intake manifold? (See picture)
Or is the best location on the radiator?


Thanks.

Cya,
Edmond
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Old 06-09-2002, 11:06 AM   #2
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Unhappy

Sorry, but there was no picture...

I hope this time it works.....

Cya,
Edmond
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Old 06-09-2002, 11:21 AM   #3
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I think you'd be better off with the switch on the radiator. The fan is intended to cool the water in the radiator based on its temperature. The water in the manifold is often a completely different temperature... both from the fact that it is separately regulated by the thermostat and because it is inherently a different temperature since it's in the engine and hasn't had a chance to cool off as much as the water that's traveled to the radiator.

Just my 2 cents. I hope it helps,

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Old 06-09-2002, 12:05 PM   #4
383 Stroker
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I would put it in one of the heads, or you can put it in the intake. I have mine in one of the heads.
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Old 06-09-2002, 09:59 PM   #5
PanelDeland
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I would put it in the intake or a head.You want to keep track of "ENGINE TEMP" not radiator temp.

Right?
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Old 06-09-2002, 10:03 PM   #6
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I guess I missed the point of the original question. I thought you were talking about the thermal switch that cuts on and off the electric fans.

If so, the fans are there to regulate the temperature of the fluid in the RADIATOR. There's no direct correlation to the fluid that's in the engine. The thermostat in the manifold is responsible for regulating water to the engine. And when it needs cooler fluid, it opens up and expects the appropriate temperature fluid from the radiator.

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Old 06-09-2002, 10:22 PM   #7
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The fan is to cool the coolant in the radiator, therfor, it needs to know the temp of the coolant in the radiater, not the engine.
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Old 06-10-2002, 04:24 AM   #8
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Why is the sender for the temp. gauge threaded into the head then?
If you have a working coolant system the temp. in the rad. (inlet) will be approx. what temp. the thermostat is.
I personally don't care what the temp in the rad is as long as the temp in the engine is within normal limits.
If your thermostat malfunctions the temp. in the rad can be drastically different from the eng. temp. So if your running a temp. controlled fan and the rad temp is normal but the eng temp is up the fan may shut off because the rad. temp is o.k.(did that make sense?)
Anyway I threaded my fan thermostat in the head.
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Old 06-10-2002, 08:10 AM   #9
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Quote:
Originally posted by BobbyK
Why is the sender for the temp. gauge threaded into the head then?
If you have a working coolant system the temp. in the rad. (inlet) will be approx. what temp. the thermostat is.
I personally don't care what the temp in the rad is as long as the temp in the engine is within normal limits.
If your thermostat malfunctions the temp. in the rad can be drastically different from the eng. temp. So if your running a temp. controlled fan and the rad temp is normal but the eng temp is up the fan may shut off because the rad. temp is o.k.(did that make sense?)
Anyway I threaded my fan thermostat in the head.

But now we're talking about 2 different things. The temp gauge is designed to tell you how hot the ENGINE is. The fan switch is designed to turn on the fan. And in your example, if the thermostat is stuck (closed), then it doesn't help one bit to have the fan switch on the manifold.

You're correct that the two temps can be drastically different. That is precisely why there is a thermostat in the manifold... to regulate that difference. Operating temp for the engine is different than the reservoir fluid of the radiator... hence warmups when you start your vehicle.
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Old 06-10-2002, 08:33 AM   #10
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It needs to go into the radiator. As noted previously, water in the motor is controlled by the thermostat. The water in the radiator is cooled by the fan. Take for example a cold 27 def F day. The engine temp is 195 deg because of the thermostat and you turn the fan on at 180, but the temp in the radiator is already 120 degrees. The fan runs cooling the water even further then the thermostat opens releasing 50 degree COLD water into the 195 deg engine, shocking the block causing localized shrinking of the cast iron and cracking the block... This is an extreme example, but the fan switch goes in the RADIATOR and not the block. It is more important in cold weather when the temp difference between the radiator and the engine is highest. Also having it in the radiator should let the engine warm up faster.
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Old 06-10-2002, 08:55 AM   #11
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All great theroys but I don't think it makes a rats a$$ difference where you screw it in. As long as it in coolant it will work. Hell their is more temp differance between the top radiator hose and the bottom one, than probably any where else in the system. And I have worked on GM cars were the factory one is in the head.
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Old 06-10-2002, 09:15 AM   #12
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Rat's ass...that's funny.
I was just going to say G.M. put's them in the head.
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Old 06-10-2002, 10:42 AM   #13
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Did I hear Somebody say HEAD!!!!!! LOL....
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Old 06-10-2002, 12:41 PM   #14
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Question Confused?

YEPPERS!!!!! I"M CONFUSED!
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Old 06-10-2002, 07:24 PM   #15
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Quote:
Originally posted by tom hand
All great theroys but I don't think it makes a rats a$$ difference where you screw it in. As long as it in coolant it will work. Hell their is more temp differance between the top radiator hose and the bottom one, than probably any where else in the system. And I have worked on GM cars were the factory one is in the head.
To those of you who insist that the fan switch goes in the head, checking the Flex-A-Lite site for more definitive information nets the following... fan installation instructions

Now, they may be incorrect, but I'm going with them since they make the things for a living.

Kenneth
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Old 06-10-2002, 08:52 PM   #16
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Apples and oranges. That is a sensor bulb that is designed to be mounted in a radiator hose. Here a a thermostatic switch that is designed to be mounted in the head of an f-body. I think GM built a couple of those things.
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Old 06-10-2002, 09:10 PM   #17
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My fan thermostat probe is made by Painless Wiring. It is made to go in the head. That Flex-A-Lite fan thermostat probe is made to go in the radiator. I like the kind I have, it works perfect, comes on exactly at 185* and turns of at 170*. Look under the hood of any newer car and you will see, the fan thermostat probe is in the intake or head.
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Old 06-10-2002, 09:14 PM   #18
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Quote:
Originally posted by 383 Stroker
Look under the hood of any newer car and you will see, the fan thermostat probe is in the intake or head.
How new does it have to be? My wife's 2001 Subaru has it sticking into the side of the radiator tank.

BTW, this appears to be turning into a urinating contest, so I'm gonna bow out (and go install my electric fan switch on the radiator like the manufacturer of the product tells me in their instructions ).

Kenneth
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Old 06-10-2002, 09:21 PM   #19
383 Stroker
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I'm sorry, I should have said most newer cars. Almost all GM and Ford cars have it in the intake or head.
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