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Old 10-06-2001, 05:07 AM   #1
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Join Date: Jul 2001
Location: Kalamazoo, MI
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Car: Z28
Engine: Edelbrockified 305
Transmission: 700-R4

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How Does a Block Heater Work?

I've been told that all they do is circulate coolant, then why does is my car half way warm after I let it sit all night with it on? It's a dealer installed option, by the way.
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[This message has been edited by MartyMcFly (edited October 06, 2001).]
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Old 10-06-2001, 07:38 AM   #2
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Car: 2002 SOM z28
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I think my car had one of those too... I was like WTF is this extension cord that leads to the fire wall for Click the image to open in full size. I was going to dare to plug it in either... but when we pulled the engine, I saw that it lead to the oil pan or so... like a heating pad for that I guess.

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Old 10-06-2001, 11:51 AM   #3
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Theres one on my bird that was on it when I bought it, I never used it. The heater doesent circulate coolant it heats it. It works like a toaster. There is a little coil inside that warms up and heats the water. A nice thing to have if you live where it gets cold.
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Old 10-06-2001, 05:43 PM   #4
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Join Date: Jul 1999
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A traditional block heater is the heating coil that fits in one of the freeze plug holes. You plug it in and it keeps the coolent in the block at or near operating temperature.

I think the one you're thinking of is the recirculating heater. It's spliced into one of the heater hoses. These usually include a small pump in them to heat up the coolent and recurculate it through the entire cooling system.

The heating pad on the oil pan is just an oil heater. Using a good low grade or synthetic oil in the winter won't need the oil heater.

Old air cooled VW's had an oil heater. It was simply a dipstick with a heating coil on the end.

As long as you're antifreeze is at a low temp (usually -45) you're block won't crank. Trying to start a car with a cold engine and cold coolent is hard on the starter as well as the engine. Using a block heater just reduces the strain on the rest of the components when you're trying to start the engine that's well below freezing.

I usually don't plug my truck in until it gets below -20c.


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Old 10-06-2001, 05:43 PM
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