Do I need to plug in Tahoe/engine heater???

[HAWKEYETAHOE]

Just wondering if I will need to plug in our Tahoe for the engine heater. It will not be driven and parked inside an unheated garage for the next 3 days or so.
See temperatures for the next few days ..

 

[Doubeleive]

Just wondering if I will need to plug in our Tahoe for the engine heater. It will not be driven and parked inside an unheated garage for the next 3 days or so.
See temperatures for the next few days ..View attachment 418707

there is no need to plug it in if you are not going to be driving it or starting it rather unless it is maybe one of those -15 below mornings.
all the heater does it warm the block so the oil isn't like molasses

 

[15burban]

If the garage is attached and insulated I wouldn't worry about plugging it in unless you leave the garage door open all the time. Our attached garage rarely gets below freezing unless we leave the door open for a little bit. My truck albeit a gas 3/4 ton ram that's parked in the pole shed with no insulation or heat I'll just go out there an hour or 2 before I know I'm going somewhere and plug it in if the temps are under 20f.

 

[Fless]

You don't need to run the heater if you're not going to start it during the cold temps.

Here's a partial snip from the Duramax's Diesel Engine Supplement -- read yours or download it from the GMC website. There are a few pages on the heater operation.

 

[Stbentoak]

there is no need to plug it in if you are not going to be driving it or starting it rather unless it is maybe one of those -15 below mornings.
all the heater does it warm the block so the oil isn't like molasses

0W-20 will never turn into "Molasses"...... This isn't 15W-40 like a big boy truck. I wouldn't worry about plugging in a LM2 unless it was sitting outside at -20, and only because it would warm up faster....

 

[Doubeleive]

0W-20 will never turn into "Molasses"...... This isn't 15W-40 like a big boy truck. I wouldn't worry about plugging in a LM2 unless it was sitting outside at -20, and only because it would warm up faster....

I just said that just for reference, It seemed like the OP thought maybe it did something more when plugged in.

 

[stedanrac]

While we’re on this subject…. I was testing out the block heater in advance of the really cold temps headed our way and I can’t see any indications that it is working or on. It’s plugged in to a live plug, but I expected to see some sort of informational message on the dash and there are none. This is a 2023 Tahoe with 3.0 Duramax.

Thanks for any help

 

[ZKWBQD]

Just wondering if I will need to plug in our Tahoe for the engine heater. It will not be driven and parked inside an unheated garage for the next 3 days or so.
See temperatures for the next few days ..View attachment 418707

I live in Texas, so the winters are not quite that cold. Although, as I write this, it's about 10° in Dallas. (I wish the government would take action about global cooling.) I spend my winters in Hawaii and my summers in California. I never do anything with any of my vehicles. One Tahoe, a Toyota, and a 2005 Ford Mustang convertible (NOT for sale). They start right up upon my return. On the Tahoe, the daytime running lights and engine stop start have been permanently disabled. I'm not sure if this matters much.

 

[TwoBigBoys n dog]

While we’re on this subject…. I was testing out the block heater in advance of the really cold temps headed our way and I can’t see any indications that it is working or on. It’s plugged in to a live plug, but I expected to see some sort of informational message on the dash and there are none. This is a 2023 Tahoe with 3.0 Duramax.

Thanks for any help

My dealer installed a block heater on my '18 6.2 L Yukon Denali. Was told it will not come on until it is below freezing; as from the post above, don't know if that is 0'C or 0'F, but it worked in Montana this weekend when it was brrrr outside.

 

[RST Dana]

My dealer installed a block heater on my '18 6.2 L Yukon Denali. Was told it will not come on until it is below freezing; as from the post above, don't know if that is 0'C or 0'F, but it worked in Montana this weekend when it was brrrr outside.

Heaters must have gotten smarter since my days plugging up our freightliner. It was plug and play. No matter what the outside temp was, when you plug it up, it heats the block.