[xarcticzonex]

ok so iv noticed since it has gotten hotter out ( its been 80- 90 here) and running down the highway shes running close to 210 but wont go over no matter how hard i run her but cools down to 185 if i let her sit or drive around 40 mph, im thinking thermostat cause it just started since i just got it out of the shop, i think they drained the coolant while the engine was hot and screwed up the thermostat just double checking to see if anyone has had this problem

 

[xarcticzonex]

im going out now to gm to get the thermostats cause there the only ones who have them is stock and i need them before i go to capital raceway tommarow, and another question that im pretty sure i know the answer too do i have to run the orange GM coolant? cause im gonna switch to the purple nitrate precharged coolant

 

[Chevyguy08]

Im not real sure its overheating, mine runs at 210 all the time, it wont get below it unless its cold as hell and it wont go above it at anytime

 

[xarcticzonex]

its been running at 185 since i got it and somtimes it would run higher then go back down but not up to 210 constant

 

[Chevyguy08]

Hmm maybe the LLY's run cooler, than the LBZ's and LMM's

 

[xarcticzonex]

its got one 180 and one 185 so i dont think it shoudl run close to 210 at all. so i think my one themostat is sticking.... WHY! the hell did they designa 2 thermostat system....wtf its stupid unless its a big 12 liter engine and needs high flow to cool... ohwell

 

[xarcticzonex]

Hmm maybe the LLY's run cooler, than the LBZ's and LMM's

i think they run hotter cause of the emission system to burn the soot out unless it has a regen switch? maybe ??? i dont know i dont know duramax all that well

 

[D-max05]

hey i have a 2005 lly and im running 210 all the time i think ur fine

 

[texasdmax]

My truck does the same thing. 180ish most of the time 210 on the highway or if i hammer on it. I dont think it is a problem.

 

[Hondarider552]

your overreacting, it's fine..

just because one thermostat says 185 doesnt mean it's gunna stay there, thats just where it opens



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[xarcticzonex]

iv had it 2 months now and has never run this hot at highway speed. ... i noticed that they changed my coolant it was orange now its purple...ish ...... i wonder if they mixed the coolant wrong. it just went in for injectors, harness, and FICM. do they have to drain the coolant to change injectors?

 

[xarcticzonex]

and another thing.. if it runs this hot at highway speed with no load, what kinda temps am i looking at while towing 9k..... i think i have a problem none of this seams right

 

[dmaxkid_90]

my lb7 is normally always between 192 and 210 depending on how hot it is and it drops to around 187 when just cruising around town.

 

[xarcticzonex]

im got the thermostats and new coolant. im gonna check a couple other things. first and if i fond nothing im just gonna do the stats and change the coolant

 

[xarcticzonex]

after doing alot of research my hoses are not hard my coolant tank is not pressurized( besides the lil pop when i took off the cap) and my fan clutch is engaging and no air pockets in the system ( as far as i can tell ). so im going with thermostats. i know it will do this if one is stuck and one is open and its running hot so im just gonna do them tommarow befor i goto capital and ill let you guys know what happens

 

[EastCoastGoose]

Of course it's never run that hot, cuz you've only had it for 2 months. It just got hot outside. Every Duramax I've been in either fluctuates between 185 and 210 or stays just under 210. You'll be fine

 

[rmcable]

Just my two cents, Mine has always ran at 210 and only moves about a needle width(down) while driving, idle it drops to about 170 to 180 ish.

For a minute there I was wondering if I had a problem since mine was doing the same thing. then I read everyone else's post..... lol

 

[Richracer1]

Yep, my 09 runs 210 as a normal operating temp. Nothing to worry about as ALL vehicles in the past 20+yrs or so have had 195 or higher thermostats installed by the factories as a way to help emissions.

 

[xarcticzonex]

does anyone know if there is a gasket on the thermostat housing?

 

[Hook'em_Horns!]

if it runs this hot at highway speed with no load, what kinda temps am i looking at while towing 9k.....

the same, just a little more fan action as the load and outside temps increase.

Your truck is running normal. :horse1