Transmission Temp

[Frankieb51]

2015 Chevy Suburban with 130k, transmission went just like everyone else's, so I had it rebuilt at a outside shop with a trusted mechanic but I keep on having to bring it back. He rebuilt it and it took a week for the converter and the new gears to shift smoothly once again (normal). But now Im having problems with the temperature. My transmission temp is skyrocketing to 260 degrees with no check engine light coming on. After doing further investagation and taking the dipstick out and looking at the fluid and touching the stick it wasn't burnt or hot at all. The stick was cold. This is causing both my fans to blow cold air which is doing nothing and the temperature stays. The engine temperature is normal around 190. I love these trucks but with the amount of money put into them to keep is insane.

[BlaineBug]

What does your re-builder say?  260 is not right.  Or the temperature sensor was damaged and is reading incorrectly?

[davester]

and can you feel any heat in the transmission cooler lines (a sign that fluid is flowing through them)?