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Thread: Transmission temperatures?

  1. #16
    JNR is offline Cadillac Owners Member
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    Re: Transmission temperatures?

    Was this the oem gauge?

    If so, good to know it goes higher than 199 F...I was on a long drive up north and it was like ~97 F the whole way and the temp stayed at 199 F the entire way (only doing 75-80 though) and thought maybe it didn't read higher, lol, as that was weird. Otherwise, it stays pretty cool most of the time, relatively speaking, according to the gauge.

    However, if I were concerned, I wouldn't rely on the oem gauge...over 200 F does sound sort of high though, but not sure in a damaging way, just wouldn't be comfortable with it...don't these use ATF for lubrication? Autos can and do run hotter (esp with high stall), so wouldn't worry about the fluid breaking down and since they're manuals, doubt it's anything to be too worried about.

    Be curious what the diff temp runs, anybody know?

  2. #17
    JNR is offline Cadillac Owners Member
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    Re: Transmission temperatures?

    As for the part of the exhaust bringing the temps up, hmm, not too sure about that...I mean, exhaust runs hotter than the transmission, but there is also some air gap between it and would think sufficient airflow enough so the residual heat wouldn't make the trans any hotter than it already is from operation. That is, unless it's touching or something, but even then...the body is aluminum and dissipates heats pretty well (not as good as copper or silver, etc. of course) esp with the airflow...

    See if you can run another temp gauge (quality mechanical) to double-check to at least rule out the oem being off.

  3. #18
    kevm14 is online now Cadillac Owners Connoisseur
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    Re: Transmission temperatures?

    Well it could be radiation heat, which you can't blow away. In other words, infrared heats up the aluminum case, which transfers it handily to the fluid.

  4. #19
    VfastCaddy is offline Cadillac Owners Member
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    Re: Transmission temperatures?

    I watch my trans temps very closely because of the autocrossing I do in very hot weather. Normal highway driving in hot weather I see high 190's. I've seen 255 momentarily after a 3rd autocross run on a 95 degree day. Leave the engine idling and it gradually comes down. I once did a school where I did a bunch of back to back runs and got an overheat warning for a second. Not sure what temp causes that. I think I saw 265F on the readout but it may have spiked higher. I've been told that the old rule of thumb was that over 250F and your oil is breaking down.

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