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#87308 04/03/2005 6:49 PM | Joined: Aug 2004 Posts: 17 Junior Member | | Junior Member Joined: Aug 2004 Posts: 17 | I've got a "53" GMC that I've installed all the running gear from a "78" Blazer.
I've modified an electric two speed fan from a 94 Ford Taurus and mounted it to suck from the rad.
What I'd like to do next is install a water temperature switch in the thermostat housing to control the fans operation via a relay. There is a plug in the thermostat housing now.
Anyone know of a suitable switch I could screw into the thermostat housing? :confused: | | |
#87309 04/03/2005 10:58 PM | Joined: Feb 2004 Posts: 29,792 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,792 | Well, I know what WON'T work! The cooling fan switches for modern cars turn on at 220 degrees, way too hot to be of any benefit for the average stovebolt engine. Try a safety shutdown switch for a tractor-trailer engine like a Cummins diesel. I think some of them are adjustable, or are set up to turn on a fan, or kill the fuel control, at a lower temperature. 180 degrees should be about right for your needs, I think. Try your local big-truck dealer's parts department, like Freightliner, Kenworth, or Peterbilt.
Edit: I just re-read your post. If you're running a modern engine, and a radiator capable of carrying 15 lbs. or more of pressure, just use the fan switch for the car the fan came from. It will turn on at 220, and turn off again at about 190 or 200.
Jerry
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#87310 04/04/2005 9:35 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The fan switch for an '88-91 BMW 325i is set up for a two speed motor and comes on at 190 for low and 210 for high.
I run an adjustable switch on my truck, but it only has one speed setting. You could wire it on low all the time and high when the fan switch comes on, though.
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#87311 04/04/2005 9:58 AM | Joined: Sep 2004 Posts: 93 Member | | Member Joined: Sep 2004 Posts: 93 | I just went through the same thing after installing an electric fan on my 38 with a 327 in it. My temp sensing switch is installed in the thermostat housing and came from Summit Racing. It kicks the fan on at about 185 degrees. They also have sensors that turn on at around 195. Go to their website and check out their online catalog, you'll find them there.
Good luck, Don | | |
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