Duramax Diesels Forum Truck of the Week
  #1  
Old 03-04-2018, 06:06 PM
Mdmax Mdmax is offline
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Default Truck takes forever to warm up

So I just put in 2 new Oem stats, coolant is testing good. What am I missing. The other day it was around 40 degrees, I started the truck and I got distracted and it idled for at least 15 minutes, when I got in the truck the needle barely moved, it took another 10 min of driving for it to come up to temp. I donít remember my last lly taking this long
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  #2  
Old 03-04-2018, 06:29 PM
$chultz38 $chultz38 is offline
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Did you get all the air out?
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Old 03-04-2018, 06:43 PM
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Is the upper hose rock hard?
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Old 03-04-2018, 06:51 PM
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I can start mine up and let it idle for 10 min and get in and have some heat but the needle won't move. It hasn't been very warm here so they are going to take alittle to warm up...
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  #5  
Old 03-04-2018, 08:11 PM
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have you checked the actual coolant temp with a scanner? my gauge isn't very accurate in my LLY
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Old 03-04-2018, 08:41 PM
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IMO, normal. These things warm up slowly.....
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Old 03-05-2018, 07:05 AM
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Sounds like my stock LB7. You basically have to drive to get heat. And my built LB7 will actually cool down if you're not driving. It can be up to temp, but 10 minutes of idling in 15įF weather and it'll drop off the gauge.

I think that's why GM went to all the work to do the high idle stuff where it loads up on the torque converter in the later year. Only way to get heat without moving.

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Old 03-05-2018, 07:53 AM
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Even my LBZ doesnít heat up that good. High idle fine, but without it youíre lucky if itíll defrost the windows in 10 minutes.


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Old 03-05-2018, 08:25 AM
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use to let my lb7 idle in single or teen degree weather for 30 min before work. it would barely be blowing some heat by the time i get in it. moved to warmer climate and i dont have this issue anymore
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Old 03-05-2018, 08:54 AM
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going to work in single digit weather if i let off the throttle and decelerated it would start cooling down. said **** it and moved to warmer weather also

now i have to run low temp stats and it still wants to get too hot in freeway stop and go... you never win
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Old 03-05-2018, 09:51 AM
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My LB7 took about 10 miles of driving before it had any significant heat. And like mentioned above, would actually start to cool off if I started idling too much
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Old 03-05-2018, 10:02 AM
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you could do like my buddies with company trucks do. 2nd or 3rd gear, wot, rev limiter bangin and you get heat REALLY fast
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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  #13  
Old 03-05-2018, 10:48 AM
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Let mine idle long enough to scrape ice off if there is any, then just drive it. Screw waiting on heat, that's what seat heaters and gloves are for
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Old 03-05-2018, 11:43 AM
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Or power brake it

That should put a little heat in the transmission which in turn will help heat the coolant
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Old 03-05-2018, 03:39 PM
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Quote:
Originally Posted by PureHybrid View Post
Let mine idle long enough to scrape ice off if there is any, then just drive it. Screw waiting on heat, that's what seat heaters and gloves are for
Yep, I have become addicted to heated seats. Makes me wonder if heated steering wheels are just as nice?

Quote:
Originally Posted by Chevy1925 View Post
you could do like my buddies with company trucks do. 2nd or 3rd gear, wot, rev limiter bangin and you get heat REALLY fast
I can't bring myself to do that to my truck or Suburban, but in my Pontiac, I start it and GO. When you pay $2k for a car (and can easily get more for the same), suddenly the guilt of hammering a cold engine goes away. And boy do you get heat quicker that way
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