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12-26-2014, 11:29 AM | #1 |
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Electric fan thermostat control.
Hey guys, got an electric fan cooling the engine. It's got the typical electro / thermo switch ( assuming bimetallic strip attached to an adjustable control ) which attaches to the radiator and senses the heat and kicks on and of based on that. I don't run a hood as my avatar shows and the described setup will either not kick the fan on at the warmer weather setting as it's unprotected from to the cold air influencing it or by the time I get it to kick on by adjusting the setting to have it kick on at a cooler temp on the radiator it won't kick off.
Does anyone know of a thermostat for an electric fan which installs internal to the cooling system to control the fan? This would read a real temp which would more accurately sense the temp and control the fan. Thx
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12-26-2014, 01:18 PM | #2 |
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Re: Electric fan thermostat control.
There are numerous adjustable switches with probes that screw into either the bottom radiator tank or into a threaded hole in the manifold, head. There are also pre-set thermo switches. Jegs, Summit, etc are full of them. I think the key here is to predetermine the threaded bung size and make sure you can adapt it to your system. Also determine the operating range that fits your expectaions. I've read many that suggest the bottom tank of the radiator or in the lower hose as the best place for the probe.
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12-26-2014, 03:26 PM | #3 |
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Re: Electric fan thermostat control.
I had one of them adjustable ones and it never worked either the fan would not come on or it would be on all the time,i put a manual switch and use it when I need to...
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12-26-2014, 03:29 PM | #4 |
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Re: Electric fan thermostat control.
vintage air has the control that you need.I have one on my 40 with air and it works beautifully.
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12-27-2014, 12:05 AM | #5 |
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Re: Electric fan thermostat control.
Used to put the probe in the radiator hose and clamp it down. Also used a ferrel fitting that fit the drain in the bottom and and held the probe.
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12-27-2014, 03:40 AM | #6 |
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Re: Electric fan thermostat control.
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Last edited by my4dv8; 12-27-2014 at 12:46 PM. |
12-27-2014, 04:28 AM | #7 |
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Re: Electric fan thermostat control.
Google:- Davies, Craig. This company have an extensive range of elect fans, water pumps and controllers. Large web site with heaps of information. Regards, Kevin.
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12-27-2014, 12:43 PM | #8 |
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Re: Electric fan thermostat control.
Thx all, found many and will decide which to use after a bit of research on them.
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12-27-2014, 02:10 PM | #9 |
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Re: Electric fan thermostat control.
A major key to proper operation of the control is the temp differential between cut on and cut off. Most of the controls don't have give that in the specs. I bought a non-adjustable thermo switch that said it cut on at 195 and off at 185. I thought that was just right for my 180 degree thermostat. When I installed it I found it came on at 206 and cut off at 177 by my laser thermometer and temp gauge. I thought it was bad, so I returned it and asked for a new one. It did the exact same thing. I was looking for a more accurate switch on-line and found the mfgr. of the switch and their description gave a tolerance of 13 degrees. The Jegs website neglected to say that. I am still using the switch because it does turn on before the engine gets too hot and most times my thermostat will allow it to cool to cut off temps.
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12-27-2014, 02:18 PM | #10 |
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Re: Electric fan thermostat control.
Your problem is not uncommon with electric fans. Many don't have a way to adjust the differential range between on and off. If it is your primary fan, it should run when the engine is running. If used as a booster, install a bypass switch so you can override the control as needed. Electric fans usually draw lots of current, sometimes more than 30 amps at six volts, so the charging system must be in top shape.
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12-27-2014, 02:34 PM | #11 | |
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Re: Electric fan thermostat control.
Quote:
I'm interested in your reasoning for running the fan whenever the engine is on? |
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12-27-2014, 04:34 PM | #12 |
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Re: Electric fan thermostat control.
I'd also like to know why it's gotta run all the time?
If the engine ain't hot, what's the benefit of having the fan running? The benefit of a leccy fan as far as I'm concerned is that it don't run if it ain't needed. Martin. |
12-27-2014, 06:30 PM | #13 |
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Re: Electric fan thermostat control.
I think what I would like to see available is a switch that would allow the fan to have a variable speed, depending on the temp. It doesn't have to run all the time at lower temperature, but It would be nice if as the temp gets into a particular zone, it would start to run and increase as the temperature rises. I have looked, but I have not found anything that would do that. It doesn't look like a complicated idea as it is only controlling the voltage of the fan motor, which is DC. Anyone know of this?
In regard to the temperature sensor/on-off switch, I got mine from Classic Instruments. They are available in different temperatures and screw into the head in front of the water outlet. It is a pipe thread and works fine, just not a variable speed control. |
12-27-2014, 06:55 PM | #14 |
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Re: Electric fan thermostat control.
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12-28-2014, 02:43 AM | #15 |
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Re: Electric fan thermostat control.
I've used these before in my cars and others. Box under the dash, the sending unit (no adapter) into drivers head and I hooked up a toggle switch as a back up in case the sender goes out (never has).
http://hotronicsproducts.com/product...6#.VJ-0uP8CAEM Last edited by 1oldtimer; 12-30-2014 at 02:09 AM. |
12-28-2014, 09:38 AM | #16 | |
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Re: Electric fan thermostat control.
Quote:
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12-28-2014, 01:00 PM | #17 |
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Re: Electric fan thermostat control.
Post #15 is the way I'll go. Will order tomorrow. Thx 1Oldtimer, with the added endorsement of you having used it successfully on several cars it's a "slam dunk"
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12-28-2014, 01:29 PM | #18 |
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Re: Electric fan thermostat control.
I don't see the temp differential in the web site. If you call to order, it would be interesting to know. Also, What is the tolerance for the advertised temps?
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12-28-2014, 01:54 PM | #19 |
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Re: Electric fan thermostat control.
HI, Take a look on line for rainbow products Fans & controls. There two speed fans & two speed controls are the best you can get.
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12-28-2014, 05:05 PM | #20 |
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Re: Electric fan thermostat control.
Hypertech has several different ones, from fixed to adjustable, that use NPT threads...run about 35-40 as I recall through Summit, Jegs, etc.
Now, might mention it's best to let the fan switch control a relay...let the relay carry the load, to turn the fan on. |
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