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07-27-2012, 07:03 PM
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#1 |
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Registered User
Join Date: Nov 2009
Location: Noblesville, Indiana
Posts: 430
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fan heat probes
do all probes that fit either in your radiator fins or the manifold have 2 prongs and just one prong gets power form the ing then the other gets ground?
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07-27-2012, 08:47 PM
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#2 |
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Registered User
 
Join Date: Jul 2009
Location: Menifee, CA
Posts: 471
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Re: fan heat probes
The fan circuit is grounded when the sensor switch closes at the prescribed temp.
Last edited by TopFuel1966; 07-28-2012 at 04:07 AM. |
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07-28-2012, 06:43 AM
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#3 |
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Registered User
Join Date: Nov 2009
Location: Noblesville, Indiana
Posts: 430
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Re: fan heat probes
where do I find a single terminal heat probe?
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07-28-2012, 06:54 AM
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#4 |
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Registered User
Join Date: Oct 2010
Location: Independence,KS
Posts: 1,477
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Re: fan heat probes
I normally use a switch from a late 80's/early 90's Camaro. It goes into the intake mainfold near the thermostat, it is 3/8 pipe thread. I will look and try to find the part number. Mine kicks the fan on at 205 and off at 187 according to the OEM specs. I bought mine from O'Reilly's here with the pigtail.
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07-28-2012, 10:50 AM
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#5 | |
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Senior Member
 
Join Date: May 2007
Location: Doodah Kansas
Posts: 7,773
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Re: fan heat probes
Quote:
the only single terminal I am aware of are temp sensors that install in the block or intake, somewhere in a cooling passage, they take their ground from the mount and output variable resistance. what you are using is a thermo switch, a bi metal strip in the switch bends as it heats up and closes the contact between the two pins. its usually used to turn on a relay, not directly to a fan, one side gets grounded and the other side goes to the trigger side of a relay. I havent ever seen a single terminal thermo switch, maybe they exist, but it wont install in the coils of the radiator.
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the mass of men live lives of quiet desperation if there is a problem, I can have it. new project WAYNE http://67-72chevytrucks.com/vboard/s...d.php?t=844393 |
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07-28-2012, 11:16 AM
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#6 |
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Registered User
Join Date: Oct 2010
Location: Independence,KS
Posts: 1,477
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Re: fan heat probes
Joe- you are exactly right, I called what I use a switch because to me that is what it does, but it is a temp sensor that grounds the relay for the fan. I should have had a few more cups of coffee before posting this morning. Sorry if I confused anyone.
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07-28-2012, 11:31 AM
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#7 |
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Registered User
Join Date: Oct 2010
Location: Independence,KS
Posts: 1,477
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Re: fan heat probes
This is a Murray 35946 called a cooling fan switch- popular on alot of 90's GM products.
I used a BWD TFS5 which is the same appearance. |
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07-28-2012, 11:53 AM
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#8 |
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Senior Member
Join Date: May 2007
Location: Doodah Kansas
Posts: 7,773
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Re: fan heat probes
yep, there ya go, good work tincan!
__________________
the mass of men live lives of quiet desperation if there is a problem, I can have it. new project WAYNE http://67-72chevytrucks.com/vboard/s...d.php?t=844393 |
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07-29-2012, 06:42 AM
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#9 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: fan heat probes
Painless offers a kit (about 60 bones)...fans on @ 205/off 185, or on 185/off 165. The kit includes the relay, circuit/ braker, & complete instuctions. Works like a champ! crazyL
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07-29-2012, 10:20 AM
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#10 |
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Registered User
Join Date: Nov 2009
Location: Noblesville, Indiana
Posts: 430
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Re: fan heat probes
fixed thanks guys for the help
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