Hi All,
I have less than 7k miles on my new Silverado W/T. I haven't hauled anything heavy in it since I bought it, and have been using it just back and forth to work. Pretty light duty. I was parked the other night in a parking lot idling and listening to the radio when I noticed the transmission temp jumped up to 189 degrees! I also noticed the water gauge was a bit past it's mid-range temp. I immediately cranked up the heater core to try to cool things down and it helped for the main radiator water temp..but the tranny sender quickly went to 200 degrees so I shut the whole mess down. Just before I did that, the transmission idiot light popped on. I left it there for several hours in 20 degree weather and came back to start the truck and head home..the tranny on start-up was still @ 70 degrees. I got up on the hiway and things came down to about 100 degrees at a legal speed on the hiway. Engine water temp was normal too. Drove for about 45 minutes that way. I tried sitting in my driveway a day or so later in park, and the tranny temp went from 120 degrees to 145 degrees in 35 degree weather fairly quickly.
Anyone have any experience with transmission overheating? And remember what they did about it? If I have to go to the dealer, I want to go armed with some knowledge. Plenty of transmission fluid. I do have the heavy-duty tranny cooler..saw no leaks around it. I'm stumped.