This has never happened to me before. I moved my dad's best friend into his new house last weekend. The trailer was fully loaded but was not overloaded. I had to back the trialer down a snake of a driveway and then push it through some mud to get it close to the house. This required using 4low and eventually I started digging in to the mud and had to stop before I got stuck. While I was positioning the trailer the engine temps started getting up to about 210-220 and the tranny temps were up to about 220-230 also (it was a real pain getting in there). Once the temps reached those levels my hi-idle was activated. Anytime I put the truck in neutral or park the idle jumped up to 1200. It was about 70 degrees out and I'm just wondering if that was normal. Actually I'm sure it is, I just never had it happen before.
Once we were done the truck and trailer came out of the mud easily. This truck is just the best!! By the way, I made more than enough $$$ to pay for the new Quad race box!!

 

weird. I've never seen this. Maybe it was trying to spin the clutch fan up fast to cool down the transmission?

 

I'm sure it's a safety feature in the engine computer to keep air/water moving through. Without water moving it's possible to get a hot spot and crack the head or the block IMHO. If you have a tranny fluid cooler in the radiator it was just heating the tranny fluid from the hot water in the radiator.

Edwin

 

i noticed the same thing with my 97..... backing trailer down a long driveway in the snow.... i believe i saw a post earlier today where crimedog has seen the same thing......

 

Thanks for the replies guys.....

 

What happened is absolutely normal. It's amazing what those computers can do nowdays
If your tranny temps were up that high then you should be looking at replacing the fluid.

 

I'd be amazed at that, since there is no computer controlling anything on your engine...

Not doubting that it happened, but still..

 

being there is no hi-idle, that didnt, but the heat up certainly happened and they will inherently idle up a bit when they get hot

 

Well, I think the culprit may be a malfunctioning fan clutch. It appears that the engine idled up to get the coolant flowing since the fan was not cooling properly. Time for a new fan clutch and trans fluid........

 

Tim Holt, the tranny guru, over at dieselram.com said that backing up is worst case for heating up your tranny. I believe he said, they use that to load test tranmissions.

Pete

 

That's the only time I have ever seen the trans temp get that high so I'd say that's true....

 

My owners manual states that when the radiator temp reaches a certain temp, 240-245 I think the computer sets it into high idle to help cool down. Don't know about the tranny.

 

The engine and trans were running a bit warm......