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Fan on our cars

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Old 09-26-2008, 08:28 PM
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onebad95
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Default Fan on our cars

Has anyone figured out a way to wire up a switch to turn the fan on while it is shut off. For example, to cool down at the track ?
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Old 09-26-2008, 08:30 PM
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Sxynerd
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M u stang World.com has a write up.
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Old 09-27-2008, 09:12 AM
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You can ground pin 85 on the cooling fan relay to a switch inside the car.
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Old 09-27-2008, 09:14 AM
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157dB
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Originally Posted by sxynerd View Post
M u stang World.com has a write up.
If I have to search M U Stang W O Rld. Co m to find the write-up,
might as well search the forum we are in now for the answer.

MustangForums - Fan Switch Post 07-09-08

Last edited by 157dB; 09-27-2008 at 09:19 AM.
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Old 09-27-2008, 09:14 AM
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Originally Posted by sxynerd View Post
You can ground pin 85 on the cooling fan relay to a switch inside the car.
Which cooling fan relay?
There are two cooling fan relays.
One for low speed and one for high speed.
And they are not inside the car.
They are under the hood in the BEC.
And the pin numbering changed at one point
between the 05 stangs and the 08 stangs.

Last edited by 157dB; 09-27-2008 at 11:42 AM.
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Old 09-27-2008, 02:46 PM
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Originally Posted by 157db View Post
Which cooling fan relay?
There are two cooling fan relays.
One for low speed and one for high speed.
And they are not inside the car.
They are under the hood in the BEC.
And the pin numbering changed at one point
between the 05 stangs and the 08 stangs.
It depends on which one you want to use... If you have a battery that can support it then do the high speed if you want.

I have mine on the Low speed, Although I have a Deep cycle blue top optima, also incorporated with my electric water pump I don't even need the car running to cool my car. i didn't find necessary for me use the high speed.
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Old 09-27-2008, 03:12 PM
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Deep cycle as the starting battery?
Wont that prematurally kill it from the high starting amperage draw.
Deep cucle only means it can be slowly deep cycled without damage.
I would think using it as a starting battery would eventually warp
the internal plates and kill a cell or two.
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