Block heater, how is it used? - Chevy Colorado & GMC Canyon
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post #1 of 6 (permalink) Old 01-12-2017, 02:34 PM Thread Starter
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Block heater, how is it used?

2007 Colorado, LS, 2.9 engine.
I had my mechanic instal an "original equipment" Block Heater #12587380. It is the style that is held in with a clip (as opposed to threaded into a freeze plug orifice), and does not make contact with the coolant...I surmise it just heats the metal of the block.
My question is: How is it intended to be used...can it be plugged in overnight without any problems, or is it intended to be plugged in within an hour or two of an attempted start?
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post #2 of 6 (permalink) Old 01-12-2017, 02:43 PM
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You can have it plugged in overnight no problem,. To save a bit of electricity, I personally have mine on a timer to start about 3 hours before I leave for work in the Am.

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post #3 of 6 (permalink) Old 05-11-2017, 02:07 PM
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The factory unit has a reverse thermostat in the cord so it automatically cuts power to the block heater at 32 degrees, rendering it pretty useless except in very cold climates. It sounds like yours might be aftermarket. 2-3 hours of operation should be sufficient but be careful to use a proper block heater extension cord it has to be short and heavy or it could overheat and start a fire.
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post #4 of 6 (permalink) Old 05-11-2017, 03:23 PM
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Yours does not sounds like it is OEM. As far as I know all OEM heaters go in a freeze plug hole and heat the coolant. The OEM one was deigned to warm the engine to a reasonable starting temperature without wasting additional electricity. I believe the maintenance temp was around freezing. So it is a plug it in and forget it. Also coolant heaters are more efficient as the heated coolant rises and colder coolant replaces it so you get a more thorough engine heating through engine coolant circulation.

I have an OEM one on my Colorado and it worked great for the winter I spent a few years back in Alaska. Here my truck is garaged so I never plug it in.

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post #5 of 6 (permalink) Old 05-11-2017, 06:00 PM
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The engine heater configuration/location was changed with the introduction of the 2.9/3.7 engine variants.
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post #6 of 6 (permalink) Old 05-11-2017, 10:03 PM
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The engine heater I ordered on my 2017 Denali lays in a dry well on the right rear of the block and heats the block and coolant within. The cord has a thermostat inside and does not activate unless very cold, it is wired to a spot next to the air filter box. I have ordered one on my last three Canyon pick up's however they live in a garage that does not approach the freezing mark. The heater is a $100 option.

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Last edited by Ibmikey; 05-11-2017 at 10:06 PM.
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