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01-02-2012, 11:20 AM
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CC Member
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Join Date: Jul 2011
Location: Peoria Illinois,
il
Cobra Make, Engine: Superformance #678
Posts: 264
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Not Ranked
Cooling Fan Controls
Ok guys,
I have 12vdc going through my fan to the common on the 3 position switch I installed. In one position (manual) it takes it to frame ground and the fan runs. In the other position it runs to a fan swith ( BWD WT359 ) the auto parts store sold me. I was told it would take the voltage to ground when the temperature got to the need of cooling and make the fan run.
This is not happening, but there is 12 volt on the wire connected to the spade and the brass body is grounded because I read 12 volt from the spade connector to the brass on the sensor.
Did they sell me the wrong thing or is it broken. The guage made it up to 220F before I cooled it manually.
Thanks  |
01-02-2012, 11:39 AM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,028
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Not Ranked
The BWD WT359 is a sending unit for a temperature gauge, not a switch.
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01-02-2012, 11:53 AM
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CC Member
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Join Date: Jul 2011
Location: Peoria Illinois,
il
Cobra Make, Engine: Superformance #678
Posts: 264
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Not Ranked
I swear people do not know their own parts do they? No wonder it doesn't want to work.
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01-02-2012, 11:59 AM
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CC Member
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Join Date: Jun 2008
Location: Chester Springs,
PA
Cobra Make, Engine: Kirkham 289 FIA #690, FRPP 427 Boss engine
Posts: 764
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Not Ranked
The 12v you are reading is feeding through the fan motor. The high impedence of your meter makes it look like there is 12v at the switch, but it is actually on the positive side of the fan motor. Sounds like you just need the correct therm switch. Here's one:
Zirgo ZFSWF - Zirgo Temperature Control Switch-Sensors - Overview - SummitRacing.com
__________________
RCR GT40 SOLD to Fast 5
Kirkham #690 289 FIA
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01-02-2012, 02:53 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Wire it a little differently and the manual overide will work while the key is on and it will be off when the key is off UNLESS the temp has the switch in the cooling system closed, allowing the fan to run after shutdown UNTIL it cools down while parked. Then it will either come on during heat soak or shut off after cooling down. Best of both worlds.
PS: As stated below, use the circuitry to control a relay with the fan wired though the relay. A switch alone is not capable of carrying the current draw of the fan motor.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 01-02-2012 at 04:09 PM..
Reason: Additional info
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01-02-2012, 03:48 PM
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CC Member
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Join Date: Jul 2008
Location: Driftwood,
TX
Cobra Make, Engine: Contemporary Cobra, 427 side oiler
Posts: 1,850
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Not Ranked
You might want to Google "cooling fan relay diagram" and look into running your circuit through a relay package.
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01-02-2012, 05:13 PM
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CC Member
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Join Date: Jul 2011
Location: Peoria Illinois,
il
Cobra Make, Engine: Superformance #678
Posts: 264
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Not Ranked
Thanks gents, a relay shall be installed if the sensor cannot handle the current.
I appreciate all of the quick feedback, but with 23 degrees around here looks like I have plenty of time to do it right lol.
Kirk
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01-02-2012, 07:58 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
fan diagram
Let see if I can post a picture of the diagram in my files.
Dwight
got it
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
Last edited by Dwight; 01-02-2012 at 08:01 PM..
Reason: add pic
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01-03-2012, 03:48 PM
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CC Member
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Join Date: Jan 2009
Location: Warrington,
PA
Cobra Make, Engine: FFR, 302, 345 Hp, EFI, WC T-5, 3.55 TL
Posts: 1
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Not Ranked
Dwight,
Is the Diode to keep the fan from back feeding 12v into the electrical system when the fan is freewheeling by the air traveling thru the rad when traveling at speed.
Tim
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01-03-2012, 04:20 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
yes I think so. I did not install a Diode. I installed a light on the dash to let me know when my fan is running. At first I had a LED light but it would blink when I was driving down the road. The fan was not on but the wind spinning the fan blades would induce a low voltage into my dash light. I had to change it for a bulb type and the problem disappeared. I could have installed the diode.
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
Last edited by Dwight; 01-03-2012 at 04:21 PM..
Reason: spelling
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01-04-2012, 05:58 AM
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CC Member
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Join Date: Feb 2006
Location: Lake Havasu City, AZ,
AZ
Cobra Make, Engine: Arps/Burroughs/Hurricane/428FE
Posts: 1,346
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Not Ranked
Check out Classic Chevy Truck Parts 47-59, Mark VIII Fand Relay Kits for the Mark IV fan relay kit. These kits will solve all your wiring problems.
Bill |
01-04-2012, 10:19 AM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,605
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Not Ranked
I don,t get all the override switches and all....:virtually every car on the road today relies on an electric radiator mounted automatic fan switch to cool the radiator. The only reason one would require an override switch is because something is not right. Get it right and enjoy trouble free driving, traffic or not. Keeping it simple seems to be the hardest thing to do.
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