<div dir="ltr">It's definitely threaded and it's not the kind that goes into a radiator line or the ones that just fit dry into a port on the block--this thing is an element exposed to coolant. It's 24mm. I thought it might be taking over a drain plug until I saw it, but if that's a drain plug, it's bigger than any drain plug I've ever seen.<div><br></div><div>I guess maybe there's just a threaded port in the side of the engine on spec that people want to install heaters as an option?</div><div><br></div><div>I guess either way somebody's going to have to look and find it. At least I know I'm not looking for a freeze plug.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jan 14, 2021 at 11:46 AM John Innis <<a href="mailto:jdinnis@gmail.com">jdinnis@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">There are different styles of those heaters. Some intended to install in a freeze plug, some intended for go in a radiator hose, and some intended to go in place of a drain plug or port plug. It sounds like he has one that is meant to go in a drain plug?<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jan 14, 2021 at 11:22 AM Scott Hall <<a href="mailto:scott.hall.personal@gmail.com" target="_blank">scott.hall.personal@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">This is mostly theory.<div><br></div><div>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).</div><div><br></div><div>Since he thinks I'm a car guy--which in his head means I know everything about all cars--he's asking for help.</div><div><br></div><div>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.</div><div><br></div><div>The heater to install is threaded. It says to torque it to 30 lb. ft.</div><div><br></div><div>The plug he's removing probably isn't...I'd think.</div><div><br></div><div>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.</div><div><br></div><div>So I guess my questions to the list are:</div><div><br></div><div>1) anyone ever see a threaded freeze plug? That would seem to defeat the whole purpose of allowing it to pop out.</div><div><br></div><div>2) anyone ever see threads behind a freeze plug? Perhaps the plug presses into a smooth port, and there are threads behind it?</div><div><br></div><div>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.</div><div><br></div><div>YouTube similarly has nothing relevant.</div><div><br></div><div>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?</div><div><br></div><div>Thanks.</div></div>
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