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Thread: Automatic Transmission Thermostat question?

  1. #1
    Join Date
    Dec 2015
    Location
    Fresno, CA, USA
    Posts
    87
    My Cars
    2005 BMW 330Ci Coupe

    Automatic Transmission Thermostat question?

    Hey guys thanks for checking out my post, so today I did my expansion tank and everything went smoothly except for one part. When I pulled out the expansion tank and I removed the thermostat for the automatic transmission I noticed it was missing a piece compared to the one that I bought off of FCP euro that matched the part number for my vehicle. Was my car running without the correct piece on the thermostat or did I install the wrong part. I looked everywhere I could possibly look at around the car inside the expansion tank area and even on the expansion tank itself and it did not fall off or get stuck. Any thought? Also if it was running without that piece will it cause any damage to the automatic transmission or could that possibly be the reason that my vehicle was leaking coolant? Photos attached. Thanks! (Regarding Auto T Stat pics, right was one removed and left one was the one installed)


  2. #2
    Join Date
    Aug 2014
    Location
    Lawrence Kansas
    Posts
    1,236
    My Cars
    2004 325XI/2008 GL320
    You're fine. Thats the right part. Every expansion tank ive ever done has broken the trans thermostat. I bet the tank was replaced before you got it and the thermostat was broken during that service, and never noticed on reassembly.

  3. #3
    Join Date
    Dec 2015
    Location
    Fresno, CA, USA
    Posts
    87
    My Cars
    2005 BMW 330Ci Coupe
    Quote Originally Posted by dhurley34 View Post
    You're fine. Thats the right part. Every expansion tank ive ever done has broken the trans thermostat. I bet the tank was replaced before you got it and the thermostat was broken during that service, and never noticed on reassembly.
    Cool, super glad you replied because it started to get late and I didn't want to drive the car that much haha

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