Dan Martinic

Poking around, I noticed this: beside the coolant temperature sensor is a threaded hole. Looks a bit too clean to have always been there.

A bit of water lies beneath it, though not directly, more like in the middle between it and the coolant temp sensor to its left.

According to the PET, it might be #13 in the pic below, a "remote temperature sensor".

Now.. no joke: I have been mysteriously losing very tiny amounts of coolant over stretched periods. This has been happening for about a year. Obviously, not enough to warrant a hunt, but always in the back of my mind to find it eventually.

Just finished AOS seals and after cleaning up the area, have been daily driving again and now I have some clues, maybe.

But... can this really have left the block on its own?? Has this ever happened to anyone? Where did it go? If it was ever there?

I'm thinking the coolant temp sensor proper may be leaking a bit.. but wondering if I should order this "remote temperature sensor"?

If it truly is missing, shouldn't coolant be gushing out?

Check it out:

Dan Martinic

Um.. just realized that I don't, in fact, have any wire or plug that would go to this piece. So.. now I'm really confused!

Dan Martinic

Alright, alright: after studying the PET and some online pics, I figured out that I've already got the "remote temperature sensor"; what should be here is a plug of some sort.

I'll have to get a mirror to see inside this hole.. maybe it's not really a hole. But everyone else's pics have some flat plug while I have a bare thread. Odd!

KVDR

What year is your car?

My '86 doesn't have a threaded hole there.

968workaholic

The threaded hole is the boss for the knock sensors used on later cars

Dan Martinic

Good to know! Thanks. KVDR... that is one clean looking block! I like all that shiney new hardware. Mine is a 1988 (late 87 production)