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post #1 of (permalink) Old 09-24-2006, 11:24 PM Thread Starter
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Trans cooler

I have a transmission cooler mounted under my CJ7 in the back just in front of the fuel tank. I would like to put a sensor inline from the tranny to turn on the fan when the trans temp gets to hot. Anyone know the best way to do this?
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post #2 of (permalink) Old 09-25-2006, 12:10 AM
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Re: Trans cooler

You want the fan to come on at a predetermined temp, automatically; is that correct?
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post #3 of (permalink) Old 09-25-2006, 09:23 AM Thread Starter
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Re: Trans cooler

Correct. The trans cooler has a fan on it.
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post #4 of (permalink) Old 09-25-2006, 09:50 AM
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Re: Trans cooler

Take a look at the Taurus Fan on Jeeps, there a several sites out there that have schematics that show you how to control the fan in three states: <ul type="square">[*]Manual On[*]Manual Off[*]Fully automatic[/list]As a couple of examples, Pnut's schematic to control the Taurus fan that you could use to to control the fan on the cooler, and then mine:



Or, another:

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post #5 of (permalink) Old 09-25-2006, 10:25 AM Thread Starter
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Re: Trans cooler

What temp should the tranny run at? It is a 904.
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post #6 of (permalink) Old 09-25-2006, 10:40 AM
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Re: Trans cooler

As cool as possible! It exchanges heat in the radiator first, so that's at the engine coolant temp. If you want it cooler... then you'd have to run the fans longer. Beware, that running fans take a HUGE amount of current. That's a drag on the engine and takes away horsepower.
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post #7 of (permalink) Old 09-25-2006, 10:52 AM Thread Starter
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Re: Trans cooler

[ QUOTE ]
As cool as possible! It exchanges heat in the radiator first, so that's at the engine coolant temp. If you want it cooler... then you'd have to run the fans longer. Beware, that running fans take a HUGE amount of current. That's a drag on the engine and takes away horsepower.

[/ QUOTE ]

My setup does not have a cooler on the radiator, it is under the jeep just in front of the gas tank. I have a over size pan on the transmission and the B&M cooler with a fan. The fan is noisy and take current like you said so I would like for it to come on only when needed. What I would like to find is a inline (with trany fluid lines) temp switch that would turn the fan on and off as needed.
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post #8 of (permalink) Old 09-25-2006, 11:06 AM
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Re: Trans cooler

Then I'd also plumb in an additional cooler in the front of the radiator, in series with the rear cooler. The front cooler would pre-cool the coolant before it gets to the back, and the fan.

Either of the above circuits would do what you want it to do.
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post #9 of (permalink) Old 09-25-2006, 03:38 PM
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Re: Trans cooler

I can understand your need to have plenty of cooling...especially in AZ, but I have to question the idea of placing a cooler in front of the gas tank...two problems, your going to be picking up a lot of residual heat from the engine and exhaust....second, there are a lot of rocks flying around in that area....I can see your cooler getting destryoed in no time.....

And the fact that you have to have a fan for it...adds to the complexity, thus increasing your chances of a failure.

This is how I handled the cooling for my 4L60 when I did my SBC swap...


The radiator in the right is for the tranny and the oother on the left is for engine oil. They are in front of the radiator so they get the coolest air possible....and I only need one fan...oh, and I'm NOT using the tranny cooler in the radiator. One important thing about transmissions is that you don't want too much restriction in the oil flow...
post #10 of (permalink) Old 09-25-2006, 09:04 PM Thread Starter
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Re: Trans cooler

OK, I took your advice. After thinking about it I don't like the idea of the fan breaking down and causing a problem way out in the woods. I installed this today and got rid of the one I had.

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