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#1
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Where should my electric fan thermostat go?
I've got an electric fan set up with a controller that has a 3/8" threaded sending unit. Where is the best place to put the s/u?
The intake manifold is a eddy air gap manifold on a 360 motor. There is a 3/8" threaded hole on the front of the manifold on the driver side of the intake manifold (opposite side of the stock sending unit location.) I currently have my water temp gauge sensor installed in this location. There is also another 3/8" threaded hole on the rear of the manifold (directly opposite of the water temp gauge sensor). I had the fan switch installed at this point, however the gauge got up to about 215* and the fan did not come on (should be on at 195/off at 185). I know theres going to be a temp difference between these locations but whatever it is, it seems to be too much for my needs. The last option I have is on the radiator. On the upper corner of the passenger side of the radiator there is also a 3/8" threaded hole. What should I use? |
#2
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Got the same
Setup. If you use the hole in the airgap, near the thermostat, the probe tip will be too far out of the coolant stream.
I used the 3/8 threaded hole in the radiator, which sits at the hot spot of the rad. Works like a champ. I suggest that you get a "on at 180, off at 160 thermostat". On at 195 is way too late. I also suggest adding an over ride switch to turn the fan on if the sensor fails.Wire it direct to 12 volts, unswitched. |
#3
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I like mine on a switch.
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#4
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Thermostat in the radiator worked for a buddies' Celebrity(I know, but I told him $400 from GM for the fans, etc was WAAAY to high when I got the Hayden dual fans for $100, with the A/C solinoid switch...J. C. Whitney special, free S&H). That rigged-up deal lasted 'til he traded cars about 3 years later. Shade-tree engineering can work wonders on pieces of crap cars.
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#5
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Quote:
I have to disagree with you on the thermostat temperatures. I have a 180* thermostat, so if the fan comes on at 180*...the thermostat would only open for a few seconds and would in turn make the engine run cold (this is a stock motor not a race motor btw). I am not a believer in having lower than stock thermostats. i dont believe there is a reason to use a lower temp thermostat in a stock/mild motor...if the engine is overheating it a seperate issue. |
#6
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I understand the idea process with the manual switch but sometimes I dont like to *always* have to be looking at my temp gauge to see when I need to be setting the fan on.
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#7
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Trust me
195 is too late to start cooling the coolant. Small blocks heat quickly, and at 195, your fan will have a very difficult time bringing it down, expecially when climbing hills. I had a 180 on fin type thermocouple before I switched to a 180wet sensor. It was always too late, even at 180 on.
My fan is a Derale 3000 CFM 20 amp 17 inch bladed unit. |
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