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Discussion Starter · #1 ·
My trans runs a little hot while towing, around 200. I wish I could have an in cab switch so that I could engage the electric clutch on the cooling fan to pull some extra air past the trans cooler when towing. It would also be nice when idling with A/C on in the Texas summer. Surely it is just a 12v feed or a grounding of a circuit that engages the clutch. If anyone know please help me out.

Clay
 

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[ QUOTE ]
My trans runs a little hot while towing, around 200. I wish I could have an in cab switch so that I could engage the electric clutch on the cooling fan to pull some extra air past the trans cooler when towing. It would also be nice when idling with A/C on in the Texas summer. Surely it is just a 12v feed or a grounding of a circuit that engages the clutch. If anyone know please help me out.

[/ QUOTE ]

You could, but it'd set codes. The Visctronic fan drive has a speed sensor that provides closed-loop feedback and if it's showing that the fan is turning significantly faster or slower than requested, it'll set a code.

Now, that said, 200F ATF temp isn't anything to worry about. The specs say 221F is the max long-term sump temp (if you're in the pressure port for your sender, that's close enough), with up to 248F allowed for short runs, say 30-45 minutes while pulling a big hill with a big trailer. If it was my truck, I wouldn't worry about 200F at all.

Okay, thought experiment time. I'm thinking of a couple of numbers. One is 1XY, the other is 2AB, where the letters represent additional digits. If you were running a digital temperature gauge for an automotive fluid of your choice, which number would prompt you to concern, 1XY or 2AB?
 

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[ QUOTE ]
2AB /ubbthreads/images/graemlins/laugh.gif

[/ QUOTE ]

Okay, there's one.
 

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With the SCT tuner we can control engagement and make it engage sooner.

Tadd
 

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Discussion Starter · #6 ·
thanks for the feedback. I guess I am going to have to break down and get an sct or larger trans pan.
 

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Or Both /ubbthreads/images/graemlins/grin.gif
 

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Mine engages even when I don't think it should. Pulling hills towing heavy I have seen 220-231 degrees frequently. It gets annoying on a long trip listening to the fan clutch when it engages at 3500 rpm every 30 seconds. /ubbthreads/images/graemlins/eek.gif I can see it coming on then, but mine even comes on at 205 degrees empty in hot weather. I might need to have it checked.
 

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thanks for the feedback. I guess I am going to have to break down and get an sct or larger trans pan.

[/ QUOTE ]

{sigh} They never listen, do they?

LISTEN TO ME, PEOPLE: 200F TRANS FLUID TEMPS ARE PERFECTLY OKAY!

By the way, 1XY is 198, and 2AB is 203. Is there a difference, in the real world, between those two temperatures beyond one being 5F more than the other? Not as far as your engine coolant, engine oil, trans fluid, rear diff fluid, transfer case fluid, or brake fluid are concerned.

But what the hell do I know about this? I've only been doing vehicle thermal management for 15 years.
 

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[ QUOTE ]
[ QUOTE ]
thanks for the feedback. I guess I am going to have to break down and get an sct or larger trans pan.

[/ QUOTE ]

{sigh} They never listen, do they?

LISTEN TO ME, PEOPLE: 200F TRANS FLUID TEMPS ARE PERFECTLY OKAY!

By the way, 1XY is 198, and 2AB is 203. Is there a difference, in the real world, between those two temperatures beyond one being 5F more than the other? Not as far as your engine coolant, engine oil, trans fluid, rear diff fluid, transfer case fluid, or brake fluid are concerned.

But what the hell do I know about this? I've only been doing vehicle thermal management for 15 years.

[/ QUOTE ]
OK what is the max. temp for engine coolant in celcius. Just want to know as I monitor it via the cluster. Also where would be the best place to tap into for a real oil pressure gauge?
Thanks again for help with the oil leak fix /ubbthreads/images/graemlins/wink.gif
 

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how about adding the largest electric fan you can find and just leave it on when towing big loads. i did this on my 991/2 and the oem fan never cams on. i removed it before i traded for the 04 but havent re-installed it yet.
 

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OK what is the max. temp for engine coolant in celcius. Just want to know as I monitor it via the cluster. Also where would be the best place to tap into for a real oil pressure gauge?
Thanks again for help with the oil leak fix /ubbthreads/images/graemlins/wink.gif

[/ QUOTE ]

I'd keep it below 230F (110C) long-term, but you could see brief coolant temps up to 245F (118C) on long, high-load grade pulls in high ambients. Realistically, I doubt anyone will ever see that in the real world, but it's possible, particularly with the new-for-2005 Tow King GCWR number (26K, if memory serves).

As far as an oil pressure gauge sender location, look up around the oil filter/oil cooler area for likely candidates.
 
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