temp sensor
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HT4100 4.1, 4.5, 4.9 Discussion, temp sensor in Cadillac Engine Technical Discussion; this week something new. i pull the '88 Allante out of the cave, D.I.C. reports temp in the 50F's, no ...
  1. #1
    Stealth's Avatar
    Stealth is offline Cadillac Owners Enthusiast
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    temp sensor

    this week something new.

    i pull the '88 Allante out of the cave, D.I.C. reports temp in the 50F's,
    no problem with that. outside it is maybe 80F or 90F, start driving
    and the D.I.C. temp is updated and climbs at the rate of 1F per minute.

    it SLOOWWWWWLY climbs to 60F and stays there for awhile,
    then jumps to 70F's and continues climbing until it reaches
    actual ambient temp.

    i know, i know, check the sensor ..
    but does anyone know if the ECM uses the same sensor for fuel mixtures?

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: temp sensor

    The outside temp display holds a memory from the last ignition cycle then updates after approx 20 mph if I recall. This is done so sitting in traffic the display is not jumping up/down with exhaust heat of the cars sitting in front of it affecting the sensor. Any Cadillac factory service manual of this era will explain it better than I. Bottom line, sounds normal.

  4. #3
    thu's Avatar
    thu
    thu is offline Cadillac Owners Connoisseur
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    Re: temp sensor

    Carnut is correct. It's to prevent wild swings in the temp display due to heat coming from the engine compartment. That's what my FSM says.

  5. #4
    MachX's Avatar
    MachX is offline Cadillac Owners Fanatic
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    Re: temp sensor

    The temp senser for ambient temps is located behind your grille, it displays the last read temp when you turn the key, and then climbs accordingly. No your ECM doesn't use that reading for anything. Mine climbs when the car is sitting idling due to heat being blown off from the engine fans. Then when I drive it drops again.

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