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Old 04-18-2012, 07:31 PM   #11
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Originally Posted by thinkinghat View Post
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.

2014 Silverado 2500 6.6L TD and 4X4
2011 Carson Standard Duty Car Hauler
2012 Forest River Stealth SK2112
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Old 04-22-2012, 01:50 PM   #12
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I have an 07 Yukon XL Denali with 6.0 engine. I am not sure of your exact problem, but I did just have mine in the dealership for the same issue, running hot when pulling on hot days. The Tech that was working on mine said that the temp going to 230 and then going back down to normal 210 operating range was not an issue. He does think that my fan motors may need to be replaced, but he could not get the temp issue to happen so my extended warranty will not cover it. I did Flush the system then and put new coolant in it, this may help but I am not sure. I am taking the camper out next weekend again, and we will be going up I-77 in North Carolina to the Koa in Fancy Gap Va, so I will see how it does on that steep grade.
One other thing to have someone check, on my 04 denali with 6.0 when it started heating up like that it was the fuel pump, engine was running very rich and cause the temp to rise.

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Old 04-22-2012, 02:02 PM   #13
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Do you mean lean?
Rich condition would not run hot
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Old 04-23-2012, 04:37 PM   #14
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Yes I did, sorry typo

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