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Old 08-27-2012, 08:45 AM
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Thermostatic switch position

I'm planning to fit a threaded boss to my aluminium radiator (Ford 393 stroker) for the electric fan thermostatic switch. Which would be better - top tank or bottom tank? My thoughts were bottom tank, so the switch comes on if the radiator's struggling to cool enough...

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Old 08-27-2012, 12:46 PM
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Originally Posted by rsk289 View Post
I'm planning to fit a threaded boss to my aluminium radiator (Ford 393 stroker) for the electric fan thermostatic switch. Which would be better - top tank or bottom tank? My thoughts were bottom tank, so the switch comes on if the radiator's struggling to cool enough...
I don't think that there would be any benefit to having the fan switch mounted in the radiator. I have, both my electric water pump and fan switch, in the water cross-over near the thermostat, on my Pontiac.
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Old 08-28-2012, 05:23 AM
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Ummm. Yea. Put the switch near the thermostat housing on the engine.... That is what you want to cool. Putting it on the radiator will not reflect the engine temp at all and will send the fans the wrong signal...
Mark
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Old 08-28-2012, 06:43 AM
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I have done about 1000 miles with my 347 stroker using a 3 core radiator and large hayden thermostatic fan. I have an adjustable thermo switch with the sensor fitted in the top hose coolant stream. So the sensor wont sense heat until the thermostat opens at around 18 5. There have been no overheating issues with this setup, works well. The fan only comes on at speeds below about 15mph when there is not enough free flowing air through the radiator. For normal driving the fan stays off as the adjustable temp switch is set a few degrees above the thermostat.
Al.
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Old 08-28-2012, 12:20 PM
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Quote:
Originally Posted by rsk289 View Post
I'm planning to fit a threaded boss to my aluminium radiator (Ford 393 stroker) for the electric fan thermostatic switch. Which would be better - top tank or bottom tank? My thoughts were bottom tank, so the switch comes on if the radiator's struggling to cool enough...
I always put radiator fan switches in the lower tank near the lower radiator hose outlet.

I'm no Rocket Surgeon, but switching the radiator fan on and off based on the radiator outlet temperature makes more sense to me than switching it based on engine temp. Most of the time, when you are driving, there is natural airflow blowing through the radiator. At 80 MPH, the volume of air naturally blowing through the radiator is likely more than the fan could ever move. Having the fan on in that situation is not productive. If that natural airflow is enough for the radiator to do an adequate job of cooling the coolant, there is no need for the radiator fan to be on. If a radiator fan is switched on and off based on the temperature at the intake manifold, the fan will run needlessly some of the time, which will make the fan wear out that much faster, and put an unnecessary load on the charging system.

At my shop, our preferred setup is a 195 thermostat, and a rad fan switch near the radiator outlet that comes on at 185 and turns off at 170.

Hope this helps.....
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