Thread Tools Display Modes
Old 04-18-2012, 07:31 PM   #11
Drinkin beer on the beach
Rod Johnson's Avatar
Join Date: Feb 2012
Location: Fallbrook, CA
Posts: 450
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
Rod Johnson is offline   Reply With Quote
Old 04-22-2012, 01:50 PM   #12
Junior Member
Join Date: Aug 2008
Posts: 9
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.

thewren is offline   Reply With Quote
Old 04-22-2012, 02:02 PM   #13
Phat Phrog Stunt Team
TURBS's Avatar
Join Date: Aug 2011
Location: Iowa
Posts: 34,207
Do you mean lean?
Rich condition would not run hot
TURBS is offline   Reply With Quote
Old 04-23-2012, 04:37 PM   #14
Junior Member
Join Date: Aug 2008
Posts: 9
Yes I did, sorry typo

thewren is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Virginia Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 11:35 PM.