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post #1 of (permalink) Old 04-16-2007, 05:49 PM Thread Starter
 
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electric fan thermostats

I have been thinking of going to an electric fan.

My question is the controlers.

I had one that had a probe that went into the radiator fins to controle the fan. I have also seen the ones that thread into the manifold. Is one better than the other. It would seem since factory fans are controled be the manifold switches that they would be more reliable and more water proof. They also seem like they would be meashuring the engine temp to turn on and off the fan. To me that seems wrong the engine temp could be 200 and the radiator temp could be 170. If the sensor turns on the fan at 180 it would be running even though it wasnt needed. Most of the manifold ones are the same on temp as my water thermostat or my continous engine temp wich (to me ) seems like as soon as my rig got to opperating temp the fan would run continous.

Normally I wouldnt care but lately I have been daily driving the rig as a comuter and am tring to get better gas milage.
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post #2 of (permalink) Old 04-17-2007, 12:36 PM
 
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Your fan shouldn't be running at highway speeds. The best controller I have seen are from these guys. It will not turn the fan on untill required and will also ramp it up and down as required.

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post #3 of (permalink) Old 04-18-2007, 07:26 AM
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I have the Flexalite and depending on the outside temp the fan does or doesn't go on. That may sound stupid but on colder days I will drive my 3 miles to work and the fan will not go on. But in the height of the summer heat it does. As for the highway if you are just cruising along on a nice level road 55-60 mph the fan usually stays off. But on hilly stretches and putting your foot to the board to make the hills it does go on. I have a light on the dash for the fan so know when it is on. Jim
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post #4 of (permalink) Old 04-18-2007, 01:03 PM
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The switches that mount on the manifold usually go through into the coolant galley. Therefore they are monitoring the temperature of the coolant around the engine and hence engine temperature. Since it is the engine temperature that needs to be regulated they make sense. They are usually a thermostatic switch and aren't the same as a conventional coolant sensor.

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post #5 of (permalink) Old 04-20-2007, 08:38 PM
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Quote:
Originally Posted by 87zuke View Post
I have the Flexalite and depending on the outside temp the fan does or doesn't go on. That may sound stupid but on colder days I will drive my 3 miles to work and the fan will not go on. But in the height of the summer heat it does. As for the highway if you are just cruising along on a nice level road 55-60 mph the fan usually stays off. But on hilly stretches and putting your foot to the board to make the hills it does go on. I have a light on the dash for the fan so know when it is on. Jim
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