thermostatic switch (to control electric fans) question??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**americanmusc1e** · 01-13-2010, 08:17 PM

I'm in the process of converting my truck to electric fans. I'm using the Altima fans from this FAQ http://67-72chevytrucks.com/vboard/s...ad.php?t=50085

I also bought a fan control kit from Summit http://www.summitracing.com/parts/HDA-3652/

I mounted the fans directly to the radiator and everything went good, I wired them up and tested them and I could activate the fans manually but I think the thermostatic probe/switch that goes into the radiator is not working, I checked the temperature right next to it using a food thermometer and it was 200*, but the switch will never turn on. it's getting power to it, but its just not working. I doubt I can send the kit back, I bought it a couple of months before I bought the fans.

Is there anywhere I can get one locally (radiator probe or coolant sensor)????

are there any oem applications for this kind of switch????

Shyguy · 01-13-2010, 08:30 PM

O'Reilly's Auto Parts has a controller that goes into the radiator, I am sure others do also.

I am not sure of the price.

What is the temperature supposed to be at when it turns the fans on?

Danny

**americanmusc1e** · 01-13-2010, 08:33 PM

Quote:

Originally Posted by Shyguy

O'Reilly's Auto Parts has a controller that goes into the radiator, I am sure others do also.

I am not sure of the price.

What is the temperature supposed to be at when it turns the fans on?

Danny

185* on and 170* off

I looked at Oreilly's today and I didn't see one. is it vehicle specific????

Sammy · 01-13-2010, 08:41 PM

I spent the extra for a varable controlled sensor. (160-200) The difference in price was only 6 or 8 bucks more.

Sammy · 01-13-2010, 08:43 PM

Any decent rad shop should have them in stock.

67ChevyRedneck · 01-13-2010, 08:58 PM

I use the DERALE 16759 kit for my S-10. Been on for almost a year n a half.

I also just ordered it again literally last night to use with the Jeep fan I ordered for the 67. It is adjustable, has an A/C override switch, which I need, and radiator probe. I got it on fleabay for $38. I had no problem wiring it in my S-10.

http://www.derale.com/

dwcsr · 01-13-2010, 09:43 PM

How are you manually starting the fan? If you ground the dark wire on the probe it should come on. The light colored wire is a grounds and it should be grounded where the fan is gronded.

If you ground the dark wire and it comes on then you have it correct to the sensor.
If you cross the sensor terminals and it comes on then its the probe. If you cross the terminals on the probe and it does not come on then you have to check that the light wire is grounded.

**americanmusc1e** · 01-14-2010, 11:29 AM

Quote:

Originally Posted by dwcsr

How are you manually starting the fan? If you ground the dark wire on the probe it should come on. The light colored wire is a grounds and it should be grounded where the fan is gronded.

If you ground the dark wire and it comes on then you have it correct to the sensor.
If you cross the sensor terminals and it comes on then its the probe. If you cross the terminals on the probe and it does not come on then you have to check that the light wire is grounded.

the kit has an extra wire for an AC clutch that I can manually start the fan with. I can also touch the two wires going to the thermostatic switch together and the fan will come on. the kit says to hook the light (yellow) wire to 12v and the other wire (brown) goes to the relay. I'm pretty sure that the switch is bad, I stuck it in boiling water last night and tried to ohm through it with no luck.

chevy_mike · 01-14-2010, 12:23 PM

This is the one I am going with, the Spal unit. Fully adjustable, uses any electric gauge temp sensor (or it's own) and ramps up the fan speed as the temps rise. Will do dual fans, variable on one fan, when temp reaches max you set, it will kick on the second fan.

Read more at http://www.spalusa.com/store/Main.as...tem=FAN-PWM-V3

Good price for it here, http://www.speedwaymotors.com/Spal-P...ign=GoogleBase

cjaj70 · 01-14-2010, 01:39 PM

Oreillys keeps them behind the counter if you can find a parts guy that has half a clue.

Heres the part number:

Hayden - Thermostatic Fan Control
Part Number: 3647

dwcsr · 01-14-2010, 10:33 PM

Quote:

Originally Posted by americanmusc1e

the kit has an extra wire for an AC clutch that I can manually start the fan with. I can also touch the two wires going to the thermostatic switch together and the fan will come on. the kit says to hook the light (yellow) wire to 12v and the other wire (brown) goes to the relay. I'm pretty sure that the switch is bad, I stuck it in boiling water last night and tried to ohm through it with no luck.

If you connect the 2 wire that go to the switch and it works then it is the switch.

**americanmusc1e** · 01-15-2010, 07:40 PM

Quote:

Originally Posted by chevy_mike

This is the one I am going with, the Spal unit. Fully adjustable, uses any electric gauge temp sensor (or it's own) and ramps up the fan speed as the temps rise. Will do dual fans, variable on one fan, when temp reaches max you set, it will kick on the second fan.

Read more at http://www.spalusa.com/store/Main.as...tem=FAN-PWM-V3

Good price for it here, http://www.speedwaymotors.com/Spal-P...ign=GoogleBase

i WISH i had that much money to spend, still really cool though.

Sammy · 01-15-2010, 09:19 PM

Pricey, but sounds like a nice setup.

dwcsr · 01-16-2010, 02:18 AM

They are nice but have limits on how big a fan you can safely power. Don't try to run a Mark VIII off it. If a DC control is what you want the go over to http://www.dccontrol.com/

01-13-2010, 08:17 PM	#1
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	thermostatic switch (to control electric fans) question??? I'm in the process of converting my truck to electric fans. I'm using the Altima fans from this FAQ http://67-72chevytrucks.com/vboard/s...ad.php?t=50085 I also bought a fan control kit from Summit http://www.summitracing.com/parts/HDA-3652/ I mounted the fans directly to the radiator and everything went good, I wired them up and tested them and I could activate the fans manually but I think the thermostatic probe/switch that goes into the radiator is not working, I checked the temperature right next to it using a food thermometer and it was 200*, but the switch will never turn on. it's getting power to it, but its just not working. I doubt I can send the kit back, I bought it a couple of months before I bought the fans. Is there anywhere I can get one locally (radiator probe or coolant sensor)???? are there any oem applications for this kind of switch???? __________________ -- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted

01-13-2010, 08:30 PM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: thermostatic switch (to control electric fans) question??? O'Reilly's Auto Parts has a controller that goes into the radiator, I am sure others do also. I am not sure of the price. What is the temperature supposed to be at when it turns the fans on? Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

01-13-2010, 08:41 PM	#4
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: thermostatic switch (to control electric fans) question??? I spent the extra for a varable controlled sensor. (160-200) The difference in price was only 6 or 8 bucks more. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

01-13-2010, 08:43 PM	#5
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: thermostatic switch (to control electric fans) question??? Any decent rad shop should have them in stock. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

01-13-2010, 08:58 PM	#6
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: thermostatic switch (to control electric fans) question??? I use the DERALE 16759 kit for my S-10. Been on for almost a year n a half. I also just ordered it again literally last night to use with the Jeep fan I ordered for the 67. It is adjustable, has an A/C override switch, which I need, and radiator probe. I got it on fleabay for $38. I had no problem wiring it in my S-10. http://www.derale.com/ __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 01-13-2010 at 09:00 PM.

01-13-2010, 09:43 PM	#7
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: thermostatic switch (to control electric fans) question??? How are you manually starting the fan? If you ground the dark wire on the probe it should come on. The light colored wire is a grounds and it should be grounded where the fan is gronded. If you ground the dark wire and it comes on then you have it correct to the sensor. If you cross the sensor terminals and it comes on then its the probe. If you cross the terminals on the probe and it does not come on then you have to check that the light wire is grounded. Last edited by dwcsr; 01-13-2010 at 09:43 PM.

01-14-2010, 12:23 PM	#9
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: thermostatic switch (to control electric fans) question??? This is the one I am going with, the Spal unit. Fully adjustable, uses any electric gauge temp sensor (or it's own) and ramps up the fan speed as the temps rise. Will do dual fans, variable on one fan, when temp reaches max you set, it will kick on the second fan. Read more at http://www.spalusa.com/store/Main.as...tem=FAN-PWM-V3 Good price for it here, http://www.speedwaymotors.com/Spal-P...ign=GoogleBase __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

01-14-2010, 01:39 PM	#10
cjaj70 Registered User Join Date: Sep 2009 Location: Perry, OK Posts: 27	Re: thermostatic switch (to control electric fans) question??? Oreillys keeps them behind the counter if you can find a parts guy that has half a clue. Heres the part number: Hayden - Thermostatic Fan Control Part Number: 3647

01-15-2010, 09:19 PM	#13
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: thermostatic switch (to control electric fans) question??? Pricey, but sounds like a nice setup. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

01-16-2010, 02:18 AM	#14
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: thermostatic switch (to control electric fans) question??? They are nice but have limits on how big a fan you can safely power. Don't try to run a Mark VIII off it. If a DC control is what you want the go over to http://www.dccontrol.com/

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