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

Subject: Re: [Shop-talk] Frost heater/freeze plug
From: Mark Miller <>
Date: Fri, 15 Jan 2021 10:21:42 -0800
References: <>
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1
I looked up kia block heater and found that they also sell press in (not 
screw in) block heaters such as:; 

So I'd recommend either a different place for that heater or a different 
heater into the freeze plug.  And: if you get involved with this and it 
fails in any way (pops out if the press in one, leaks for a thread in) 
then it instantly becomes your problem. I'd recommend directing him 
towards his Kia dealer/service shop if he can't take care of it himself .


Mark Miller   707-490-5834

> Message: 2
> Date: Thu, 14 Jan 2021 11:20:26 -0600
> From: Scott Hall <>
> To: "" <>
> Subject: [Shop-talk] Frost heater/freeze plug
> Message-ID:
>       <>
> Content-Type: text/plain; charset="utf-8"
> 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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