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How do you change a block heater on a 1981 GM truck?

Updated: 8/17/2019
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14y ago

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Locate the block heater. Drain out the coolant from the rad and from the block if there is a drain there. There should be a screw in the center of the block heater. Unscrew it to loosen the block heater internal clamp. Use a pair of pliers and wiggle it free. As long as it is not plugged in, there should be no worry of damage. It is sealed with an o-ring.The element will have to be worked out as it goes into the block along the side.

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Q: How do you change a block heater on a 1981 GM truck?
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