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Re: [Shop-talk] Frost heater/freeze plug

To: Scott Hall <>
Subject: Re: [Shop-talk] Frost heater/freeze plug
From: Phil Ethier <>
Date: Thu, 14 Jan 2021 11:51:15 -0600
References: <>
You need to see the part of itself and not just the paperwork.

Has anyone ever actually seen a freeze plug save an engine block?

Sent from my iPhone

> On Jan 14, 2021, at 11:21 AM, Scott Hall <> 
> wrote:
> This is mostly theory.
> One of my staff wants to stick a frost heater in his car--it's a Kia with a 
> 3.3L engine (though I don't think that matters for the question).
> Since he thinks I'm a car guy--which in his head means I know everything 
> about all cars--he's asking for help.
> He brought in the instructions and the heater itself. The instructions are 
> pretty simple: drain coolant, "remove plug" (quotes mine--it just says 
> "plug", so I'm assuming that's a freeze/expansion plug), screw in heater, 
> refill coolant, etc.
> The heater to install is threaded. It says to torque it to 30 lb. ft.
> The plug he's removing probably isn't...I'd think.
> Obviously without rolling under the car, who knows? But I'm tempted to tell 
> him to not start--the only way I know to remove a freeze plug is to drill a 
> hole in it, then pull it out with something. If there are no threads behind 
> it--and I can't imagine that a press-in freeze plug presses in to a threaded 
> hole--then he's just going to need a new freeze plug to reinstall.
> So I guess my questions to the list are:
> 1) anyone ever see a threaded freeze plug? That would seem to defeat the 
> whole purpose of allowing it to pop out.
> 2) anyone ever see threads behind a freeze plug? Perhaps the plug presses 
> into a smooth port, and there are threads behind it?
> We called the manufacturer who confirmed that the part number is correct. 
> It's used on several models so they couldn't say for sure other than, "it'll 
> work". I'd hate to see this kid pull out a freeze plug then be screwed.
> YouTube similarly has nothing relevant.
> Anybody have any experience with this before I just have him drive over and 
> roll under the car to see what I'm looking at?
> Thanks.
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