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Discussion Starter #1
Driving home from work the other night (approx 15 miles) my Edge CTS says Trans fluid is 140 degrees, which is about normal. I'm not towing anything, bed is empty.

Other half messages me asking to pick something to eat. Run through drive through. While sitting in drive through idling and in gear, temperature creeps up to 170 degrees.

Done this once before about a month ago. Should I be concerned? What should I look for if anything.

Recently had HPOP lines changed, when the hpop lines were changed shop did an oil changed an refilled with Rotella T4 whereas I normally use RP Duralect. Recently flushed power steering fluid.

Havent checked trans fluid yet to see if it's black or still red. Off this week and will get to that.
 

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What was the ambient temp? 170 is not too hot but is pretty high for just sitting there. Idling in gear will create more heat than idling in Park but I doubt it would cause that much.

The general rule is 100 + ambient temp = trans temp for normal unloaded driving


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I wouldn't be worried about that at all. Ideally, you want your fluids to reach operating temps (~180°F). Anything over 190°F is when I start to watch but don't become concerned until about 220°F. That's hauling in the mountains and when I generally back way off.
 

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your fine 170 isn't even warmed up
 

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Discussion Starter #6
Thanks for the answers. Only concerned cause I havent' seen it climb that high before. It usually averages 140-145 degrees.

I have the stock trans cooler, was close to 80 and humid that night as far as weather.
 

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So we all agree 170 is ok
But since you asked- a couple possible theories
Vehicle in front of you was spitting some warm exhaust in the area of your trans cooler, it is mounted low.
Or- your original cooler or check valve is clogged up a bit and it is going to the by pass at lower pressures. I doubt it but both possibilities.
If you have noticed this is different than before keep an eye on it- or maybe you just never noticed it in the past.
The 6.0 cooler is an easy swap, great bang for the buck upgrade.
 

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If auto, I have found that the 4r100 trans. bypass tube check ball and spring can become closed not allowing the fluid to flow to the cooler to keep your temps low (140 range). Might want to look into deleting or replace that bypass tube. I recently deleted mine, so that the fluid continuously goes to the cooler. Hope this helps, and just a suggestion.
 
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Your fine st those temps, I bet as soon as you started moving again they dropped a bit, if they continued to rise then I would be worried!
 

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If auto, I have found that the 4r100 trans. bypass tube check ball and spring can become closed not allowing the fluid to flow to the cooler to keep your temps low (140 range). Might want to look into deleting or replace that bypass tube. I recently deleted mine, so that the fluid continuously goes to the cooler. Hope this helps, and just a suggestion.
I also deleted mine- when i did the 6.0 cooler. My old cooler fell apart on removal.
 
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