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Old 03-01-2007, 09:03 PM
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Need a sending unit sensor for my electric fan

I'm going to be ordering from summit soon and want to order as much at once as possible. What I'm looking for is opinions and experiences with a good sending unit. Vehicle is an '85 s10 blazer 4x4, with a 350, corvette radiator and a taurus electric fan. I'm a little confused on what temp range to go for. I've read on here that operating temps at 180 are about optimum for effeciency and engine life. All I want/need is a sensor that will activate the relay. I don't want a radiator probe, so I'm thinking of a thread in unit on the intake. I'm looking at either this painless unit or this be cool one. I'm thinking that I should go with a 195 or 200 turn on. Then maybe use a thermostat of about 185?? Thanks

Jason

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Old 03-02-2007, 06:19 AM
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You can go to a NAPA store and look at some of your options.

I have a switch that turns on @ 220--off at 205---195 t-stat
Probably a bit warm, but is only needed when not moving.
At about 30mph it runs around 200*
454-twin Spal fans-BeCool rad

Bryan
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Old 03-02-2007, 10:36 AM
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The turn-OFF temperature for the fan control must be higher the thermostat rating.

If a 180* thermostat is used, a 185* fan control turn-OFF temp. would be used.

If the turn-OFF temperature is lower than the thermostat rating, the fan will never turn off because the thermostat will begin to close if the water temperature goes below 180*.

vicrod
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Old 03-05-2007, 12:25 AM
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Thanks for the info guys. Now if I can only find something in that range.
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Old 03-05-2007, 04:07 PM
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Doc here,

A little advise, that is a common misconception when asking for the part..

Be sure the parts guy KNOWS it is a FAN MOTOR temperature SWITCH..not a SENDER.

The book will show two..Engine Coolant Sender, and Engine fan switch..the two usually are not compatible (either electrically or mechanically) It will save you some "hair pulling" hours of figuring out why..

Doc
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