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Old 06-05-2015, 08:52 PM   #1
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Just got back from a trip when is a engine or transmission too hot?

Have a 2007 Chevy 2007 2500hd 6.6 diesel pick up hauling a 10 pound fifth wheel. Hauling up 7 percent grade for 4 miles and the engine and tranny registered 250 degrees. But went down to 200 after going down hill is 250 too hot for the transmission? 270 is in the red zone please advise
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Old 06-05-2015, 09:31 PM   #2
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10,000 pound trailer
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Old 06-05-2015, 09:39 PM   #3
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Yes I'm definitely gonna say that's too hot. I believe you have an issue that's causing it to run that hot.

We're you pushing it hard as she would go? If not, definitely a problem. Do you hear the fan clutch kick in and the fan speed up?

Chad
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Old 06-06-2015, 12:28 AM   #4
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250 on the trans is a little toasty, but it happens with stock coolers.

however a motor with a cooling system in good condition should never reach 250. IMO anything over 230 is to hot.
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Old 06-06-2015, 06:52 AM   #5
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If it were my transmission I would change the fluid,does it smell little like burnt toast?
Next time back off the gas a bit on those assents.
I doubt you did any damage to anything but shorten the life of the fluids.
Did the cooling fan get real loud - like a jet plane?
Make sure everything is functioning properly,then just slow down a little next time.
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Old 06-06-2015, 07:36 AM   #6
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Agree with all the above. Suggest you change the trans fluid over to full synthetic for insurance. Seems that I remember hearing that GM has had some issues with older trucks overheating when pushed under heavy loads. An extra trans cooler may be in order.
Change the fluid and pull over to let cool if it happens again.
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Old 06-06-2015, 09:38 AM   #7
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This chart may help Transmission temperature/failure chart.

To reduce heat on an uphill, down shift and use 1/2 throttle or so. Let that big fan move air. Clean debris from cooling fins on your systems.
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Old 06-06-2015, 10:12 AM   #8
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...registered 250 degrees. But went down to 200 after going down hill is 250 too hot for the transmission?
225 is the red line for ATF. But you probably won't hurt anything in the tranny if you don't exceed 245 for more than a quarter-mile or so to get over the pass. But 4 miles @ 250 is too hot for too long.

So definitely flush the tranny using only full synthetic ATF (such as Mobil 1 available at Wal-Mart). Do NOT use any sort of flush chemicals, just use plain ole ATF to flush the tranny of all the old ATF. And run only full synthetic ATF from now on. Synthetic can take more heat than dino ATF without breaking down.

If you have an accurate gauge that tells you tranny sump temp, then use 225 as the red line. If not, then install an aftermarket one, with the sender in the sump (pan).

And on my diesel pickup towing machine, I also replaced the stock oil-to-air (OTA) tranny cooler with one that had about twice the BTU capacity. Using synthetic ATF and that large cooler, I never saw more than 210 tranny sump temp during around 100,000 miles of towing over all sorts of mountain passes.
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Old 06-06-2015, 10:23 AM   #9
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Quote:
Originally Posted by Max Freedom View Post
Have a 2007 Chevy 2007 2500hd 6.6 diesel pick up hauling a 10 pound fifth wheel. Hauling up 7 percent grade for 4 miles and the engine and tranny registered 250 degrees. But went down to 200 after going down hill is 250 too hot for the transmission? 270 is in the red zone please advise
Max Freedom
What does your owners manual say about transmission temps?
Mine says 140F to 250F is normal/acceptable.
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Old 06-06-2015, 10:26 AM   #10
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It also depends on the transmission. Ford's 4R100 really shouldn't have gone over 225*F, 200*F for comfort. But their 5R110 and 6R140 are designed to stay around 150*F idling, higher, much higher running.
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Old 06-06-2015, 10:48 PM   #11
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Do you have a EGT guage and what were the temps. Somewhat comparable, pulling 9,000+ up Monteagle pass west of Chattanooga, (4-6% over 5 miles) and I've never seen more than normal but slightly higher engine and transmission temps and 1,100-1,200 EGTs. I come out of drive, go to manual and keep the RPM between 1,700 and 1,800.
I'd have it checked out if I were you. And like they are saying, it ain't gonna hurt to change transmission fluid and filter.
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Old 06-07-2015, 07:51 AM   #12
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Why dont you contact chevy and ask what too hot is if you really want to know? Get the facts not personal opinions.
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Old 06-07-2015, 07:59 AM   #13
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Your 2007 truck may have more accurate gauges, but here's another possible issue. On my two older GM chassis motorhomes (1995, and 1999), the dashboard coolant temperature gauges read cool by 20-30 degrees compared to seperate gauges or a scangauge. I really like the scangauge since it reads input directly from the engine CPU.

And 250 is too hot for tranny temperature. I installed aftermarket transmission coolers on 4 different motorhomes, even though they already had factory coolers. I almost always tow a car trailer, and not a single transmission issue in almost 400,000 miles.
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Old 06-08-2015, 08:02 AM   #14
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Make sure those radiators are clean. When they get packed with bugs and the fins get bent over time, it's easy to reduce cooling capacity by 30% or worse.
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