block heater - Page 5 - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #41 of 45 (permalink) Old 12-04-2012, 06:19 PM
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Join Date: Jan 2012
Posts: 576
It's not do much so it starts but it's way better fit your motor & less warm up time equals less fuel plus faster heat 30 degrees f takes a lot to heat up a diesel after sitting all night and in upstate ny 8-10 hours a night isn't really noticeable in my nyseg electric bill

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post #42 of 45 (permalink) Old 12-05-2012, 02:20 PM
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Join Date: Feb 2011
Location: SW Ont
Posts: 3,906
GM's opinion is use it below 0*F.

Engine Heater
The engine coolant heater can
provide easier starting and better
fuel economy during engine
warm-up in cold weather conditions
at or below −18C (0F). Vehicles
with an engine coolant heater
should be plugged in at least
four hours before starting.
To Use the Engine Heater
1. Turn off the engine.
2. Open the hood and unwrap
the electrical cord. The cord
is located in the engine
compartment, on the
passenger's side of the vehicle,
near the right side auxiliary
3. Plug it into a normal, grounded
110-volt AC outlet.
Plugging the cord into an
ungrounded outlet could cause an
electrical shock. Also, the wrong
kind of extension cord could
overheat and cause a fire. You
could be seriously injured. Plug
the cord into a properly grounded
three-prong 110-volt AC outlet.
If the cord will not reach, use a
heavy-duty three-prong extension
cord rated for at least 15 amps.
4. Before starting the engine, be
sure to unplug and store the
cord as it was before to keep it
away from moving engine parts,
and prevent damage.
The length of time the heater should
remain plugged in depends on the
outside temperature. You may wish
to use the coolant heater to improve
ease of starting at temperatures
between −18C (0F) and −29C
(−20F). Keep the coolant heater
plugged in for a minimum of four
hours. At temperatures below −29C
(−20F), the coolant heater should
remain plugged in for at least eight
hours. It will not harm either the
coolant heater or the vehicle to
leave the coolant heater plugged in
longer than the times stated. Be
sure to remove and store the cord
before starting the engine. See Fuel
for Diesel Engines on page 9‑16 for
information on what fuel to use in
cold weather.

2011 GMC 2500 LML CCSB 4x4 SLT
sold 2010 GMC 2500 LMM CCSB 4x4 SLT
sold 2004.5 GMC 2500 LLY ECLB 4x4 SLE
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post #43 of 45 (permalink) Old 12-05-2012, 02:36 PM
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Join Date: Apr 2012
Location: North Texas
Posts: 104
Mine originally came from dealer in the Houston area and it does have one.

2005 LLY crew with long bed. 3 inch front (leveled) lift, ranch hand bumpers all around and steps, PCV reroute, aFe turbo mouthpiece, EGR blocker plate and fingerstick extreme brand 17 in. chrome wheels and 285 Michelin tires, Bilsten shocks all around.
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post #44 of 45 (permalink) Old 12-12-2012, 06:17 AM
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Join Date: Nov 2012
Location: north idaho
Posts: 1,590
i dont know whats up with mine.. truck has 1100 miles on it. ive been using the heater for a week. temps are starting to get between -2 to -17 and now the heater isnt working. figure it must have been the cord so i went and got a 12 ga winter cord and park closer to the building. i plug it in over night and when i go to start it in the morning it reads literally 1/8th over cold. (so like 170*) before it was almost up to temp.. did i break it? haha
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post #45 of 45 (permalink) Old 12-12-2012, 08:56 AM
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Join Date: Apr 2008
Location: A little house on the prarie, NE
Posts: 9,708
If it shows any temp on the gauge at all after having it plugged in, then its working. When temps get colder its obviously harder to keep the block warm so it won't maintain as high of a temp as before.

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2004 LB7
Tastefully modded
Lots of miles
Built by Husker Diesel
1995 Chevy 2500 - 12v/NV4500 Swap
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