Coolant Temperature Sensor location

Discussion in 'General Motoring' started by stinknugget, Oct 30, 2005.

  1. stinknugget

    stinknugget Guest

    I just bought a CTS (Part Number 385146) for my 2000 SL and I don't know
    where it goes. It's a small piece about 2 inches long and has a two-pin
    plug at one side. I believe it should thread into the block or radiator
    somewhere but after looking under the hood for some time, I can't figure
    it out. If someone could explain in simple terms where it goes, that would
    be much appreciated.


    P.S. If the SL is still running extreme idle and I have to change the
    Automatic Idle Air Control Motor (which I haven't bought yet), I may need
    help locating that too.
    stinknugget, Oct 30, 2005
  2. (Note: Info below based on a '95 DOHC SW2. Yours should be similar.).

    Open the hood. Immediately to the right of the valve cover, between it and the
    air hose, is a can-like object mounted vertically on your engine block. This is
    your EGR valve. Just below and slightly behind the EGR valve is a little dingus
    sticking out of the block with a wire leading from it. This is your CTS.

    Drain radiator. Remove wire. Remove CTS. Install CTS (use teflon tape or
    antisieze compound on the threads). Do not overtighten! Attach wire. Refill
    radiator. Drive.
    William Hughes, Oct 30, 2005
  3. William Hughes <> typed until their fingers bled, and
    came up with:

    Don't bother to drain the radiator. when you pull the old CTS out,
    you'll lose maybe a pint of fluid. just put something on the ground to
    absorb it, and then top the fliud off when you're done. then just rinse
    off the tranny to get the leftover old fluid off, and enjoy you fixed
    Kevin M. Keller, Oct 30, 2005
  4. This assumes a cold engine and unpresurized cooling system :)

    (yes, that's how I found out about it too. Doh!)
    Philip Nasadowski, Oct 31, 2005
  5. Philip Nasadowski <> typed until their fingers bled,
    and came up with:

    Well, yeah... I really don't like burning myself, so I tend to work on my
    car when it is cold. That's one of the good things about DIY.
    Kevin M. Keller, Oct 31, 2005
  6. stinknugget

    The Real Tom Guest

    I have to add from my experience in changing my CTS, if you have the
    new CTS all preped with 'removable' lock-tight, you can unscrew the
    old one and have the new one in fast enough that draining any coolant
    isn't necessary. I'm guessing I've been lucky when I do it, since the
    engine is nice and cool, and the overflow tank cap is tight.

    Rememer, if you are at all uncomfortable in doing any auto work, find
    a qualified person. Might cost you like 30 bucks over the $10 CTS
    purchased from Napa.


    tom @
    The Real Tom, Nov 1, 2005
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