cooling fan switch

[wiebewagon]

im looking for a cooling fan switch controller thing, but im looking for one that can take the temp off of my temperature sending unit.  i dont want to poke a hole in my radiator to get the temp.  im doing a duel contour fan, i want to have low speed wired to the thermostat and get the high speed wired to a switch that i can kick on when its getting hot or i plan to do the heavier wheeling and what not, any ideas and suggestions? thanks in advance

[jbolty]

im looking for a cooling fan switch controller thing, but im looking for one that can take the temp off of my temperature sending unit.  i dont want to poke a hole in my radiator to get the temp.  im doing a duel contour fan, i want to have low speed wired to the thermostat and get the high speed wired to a switch that i can kick on when its getting hot or i plan to do the heavier wheeling and what not, any ideas and suggestions? thanks in advance

I went through this search and there are not a lot of good options.

Best choice is to find an available fitting somewere in the water flow and put in a switch; but in my case everything was already being used.

I had considered drilling and tapping a hole in the thermostat housing but there is no flow there till the thermostat opens so I question how accurate it would be.  There are lots of write ups with guys adding a tee to a heater hose but unless the temp probe is long enough to extend into the water flow there is potential for a dead end up inside the tee with no water movement and a false reading.  There is a controller available that uses the existing sender but it's $$$.


After much agonizing I finally went with the flex-a-lite controller with the radiator probe.  It just requires a small gap in the fins. I made the opening a little oversize and packed it with JB Weld so it holds tight and gets good temerature transfer.  Has served me well for a couple years so far with the taurus fan on auto for low speed and a manual switch for full high.

[87K5BLAZER]

A few years ago I found a guy at the Pomona swap meet that sells electric fans. He had a switch that goes into the thermostat housing and is wired from the battery to the fan. It turns on at about 180 and turns off at 165. I had it installed on my 65 Chevy P/U and it worked great. When I would stop somewhere and go inside, it would continue to run and cool the motor. People always said hey you forgot to turn off your fan but I didn't worry about it. I would probably search electric fan manufacuters. I wanna say it cost about $35 for the switch.
http://www.jegs.com/i/Perma-Cool/771/18899/10002/-1?parentProductId=1176760
Here is a link to one that I found. Good luck.

[jeepsterrob72]

i have a switch that is adjustable to whatever temp you want. it goes into the hose and you clamp around it. ive used them before with no problems. it is yours if you want it.

[dezertcrawlin]

The contour fans are single speed, but are dual fans.  I have them on my jeep and run a thermostatic switch and also a toggle switch for back up in case the thermostatic switch fails.  I used this http://www.speedwaymotors.com/AFCO-Electric-Fan-Switch-200-Degree,39909.html and wired it up so both fans run and than shut off at 185.  My jeep never goes over 200 even in the dunes and the fans don't run long as they cool it down very quickly.  Mine is in the thermostat housing after the thermostat.  Which is fine because the thermostat will open before the fans need to come on.