how to replace a block heater

Old 12-09-07, 08:30 AM
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how to replace a block heater

Hey I have an 02 impala and noticed it started rough even when it was plugged in (right now its -30C where I live. Anyways I checked the Cord and it has continuity right along all three lines
and does not register any cross readings which tells me the cord is fine. I have never before had to replace a block heater and looked at a few pics on the net and noticed it had an o ring on it leading me to wonder whether the darn thing is not submersed in either the oil or the coolant. Is this the case? If so I had better stop before I turn the fastening bolt on it and loosen it. Also are they usually stuck in there hard as it is on the firewall side of the engine. Thanks in advance for any help...
Old 12-09-07, 09:18 AM
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It would be in the coolant.
Old 12-09-07, 01:12 PM
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The block heater warms the coolant in the engine block. To change the block heater you will need to drain coolant. To test heater you can measure ohms across the two flat pins on the plug. I dont know the exact ohms reading but it should be extemely high. If your meter read open or OL your heater is bad. hope this helps.

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