Chevy 2500 HD 6.0 question

[jkilroy]

I’m towing a 7500 lb. Cougar 28SGS. The truck I have is a 03 Silverado 2500 HD 6.0 with 4.10 rear. This rig tows fine in cooler weather with no A/C and fairly flat to moderate hills. When I pull in decent mountains and it’s hot the trans temp climbs past 200, and coolant goes to 230 range. As soon as I turn off a/c everything is fine. Has plenty of power I must say. I usually set rpm to 3000 and let it run.

So question is can I do anything to truck to help the problems? Can I put a cooler thermostat in it? I’ve already added a second trans cooler. It helped a little. A diesel is in my future but I’d like to pay off camper first if possible. They are so expensive.

[donn0128]

About all you can do short of another truck is take it to a radiator shop and have them deep clean the radiator, new thermostat, cap and fresh coolant. I suspect you bumping up on the trucks limits as the root of your problem regardless of the numbers.

[MinnCamper]

I had the same problem with my 2000. Four years ago found a 06 Duramax and never looked back. I wish I could help on the issues. Good Luck