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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2008 Posts: 239 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 239 | Planning to install an electric radiator cooling fan. The heat gage on my truck is the original mechanical type with the sensor in the original location on the head. I also need a sensor to control the electric radiator cooling fan. I have one location for the sensor and need two different type heat sensors. Any ideas? | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | If you have a 235 you can use a 261 water pump which has 2 holes for fittings on the intake. | | | | | Joined: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | Why not drill and tap another hole in your head? Any one of the bump outs above the manifold runners on the head will get you into the water jacket.
Go to autozone.com and look for a SW501 or TFS-6. They are temp switches for an early Ford Escort. They have 3/8-18NPT threads and only a one wire hook up. It's really simple to install, you just hook the ground side of your fan relay to the temp switch.
Last edited by Whitedog; 03/02/2012 5:55 AM.
| | | | | Joined: Jul 2007 Posts: 328 'Bolter | | 'Bolter Joined: Jul 2007 Posts: 328 | Look for a "probe" style heat sensor specifically for electric fans; many fan manufacturers offer these as an option.
It slides right into the fins of the radiator and goes to a little relay that actuates the fan; some have adjustable off/on capability.
... no plumbing or drilling to deal with.
| | | | | Joined: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | I was just on JEG's website and Flex-a-lite has an inline hose fitting with guage ports. No drilling or tapping either, just split your hose, insert, and tighten hose clamps.
I've never used or seen the probe type, that Squire is speaking of. I would rather have a something that has coolant flowing over it. Just my $.02 worth. | | | | | Joined: May 2004 Posts: 1,312 'Bolter | | 'Bolter Joined: May 2004 Posts: 1,312 | Probe type works great. Slides thru the radiator fins below the high water mark in the rad. Mine also has an adjusting knob control so you can set on / off temps. | | | | | Joined: Feb 2004 Posts: 29,767 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,767 | Use a thermostat housing for a late model Chevy 6 or 8 cylinder engine with a threaded hole for an emission control sensor. It will monitor coolant temperature just as it leaves the cylinder head.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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