Leaking trans cooler.

[JayTheCPA]

Towing a load 180 stats will only delay the over heat, in my opinion. (Towing a load up hill for a long distance)

Welcome!!!

Question: If this configuration only delays the situation, aside from not towing with a 6.5, is there a known / target / theoretical setup that prevents it?

 

[WarWagon]

Hello,
If you would like my 2 cents worth about your Diesel heating UP, I can tell you from what I know. I was a trans calibrator for 4L80-E and interfaced with the 6.5L Boys for a number of years and on a few trips.
FYI.. Towing a load 180 stats will only delay the over heat, in my opinion. (Towing a load up hill for a long distance)

There are a number of cooling issues that were solved for the 6.5. Bill Heath did a lot of research to solve the issues. For example there is a balance flow issue with older water pumps where one side of the engine gets more flow than the other.

Keeping a clean radiator including removing the mat of built up junk behind the oil coolers, replacing the 6 blade cooling fan with a 9 blade or dmax fan, low temp fan clutch, HO water pump... Fan clutch that is less than 5 years old... That will tow and keep you at or below 210. The oil cooler(s) in front of the condenser seriously messes with AC performance in extreme hot weather. The 4L80E's simply run hot 220 being the high normal. The factory cal fan comes on too late to keep you under the 210 temp redline.

The main cooling issue is the delay of getting the fan on after you go and stay at WOT pulling a hill. Even heavy throttle will heat things up faster than things can heat up and kick the fan in. All while your ECT goes up. You have to heat up the thermal spring on the fan and then the fan has to move the working fluid to finally kick in. This delay swings the ECT from 180 to 210 easy.

 

[WarWagon]

How bad is this from dropping the pan? See the white sludge and water drops. Ignore the flash on the last shot as the water bubbles are to the left.

 

[Will L.]

I don't think it's all that bad. If you had enough coolant in there to damage the clutch disks you have more material in there as well, or darker fluid from the material coming off.

Where the radiator supplier say about going in on the cost of rebuilding the tranny?

 

[WarWagon]

Got a ton of oil in the coolant still. Not convinced I have the issue fixed and the rad shop isn't finding a leak in the old cooler. So...

 

[Will L.]

Remember you are going to still have coolant in the bottom of block below freeze plugs it's near impossible to get out.

As ready to shop saying that is not a problem with the new radiator that's because they don't want to have to pay for your transmission. Where else do you have the possibility to exchange transmission fluid and coolant?