Originally Posted by thinkinghat
We now pull our 2011 26 RLS Flagstaff with a 2003 Yukon Denali XL with the 6.0 engine. We're looking at a 2005 Suburban 2500 with 8.1 engine as we feel we need more power up and down high hills. The Denali pressure gauge goes up about 15 degrees or more when pulling in the hot summer. Does anyone have experience or knowledge of the comparison between the two? Thanks a bunch.
Yeah, definitely shouldn't be getting that hot.
Did we figure out if you have electric or mechanical fans? I think, much over 35MPH, the air coming through the grill is more than the fans could ever pull through.
Do you have an aftermarket grill, maybe a billet grill? Those can restrict air flow to the radiator.
How many miles on the Denali? Might be time for a coolant flush, new thermostat, fresh coolant, and maybe hoses, too.
How is the coolant level?
What kind of shape is the water pump in? I wonder if the impeller inside didn't come apart, or just rust apart.
When the Denali is running hot, are you also running the A/C?
You can see my truck and trailer in my sig. I do ok, I just go slow on the grades... My needle is normally just on the low side of 1/2, about 180. When pulling grades, it goes to just on the high side of 1/2, about 205. You have a bigger motor... Shouldn't be getting all that hot.
Aftermarket trans cooler is always reccomended.