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Thread: temp sensor

  1. #1
    Stealth's Avatar
    Stealth is offline Cadillac Owners Enthusiast
    Automobile(s): Is one enough ?
    Join Date
    Jun 2003
    So CA

    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): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003

    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 is offline Cadillac Owners Connoisseur
    Automobile(s): 2003 STS w/BoseNav, 1993 Deville, 1985 Deville
    Join Date
    Jul 2003

    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
    Automobile(s): 1991 Sedan deVille 4.9L/1994 Lincoln Town Car 4.6L
    Join Date
    Dec 2004
    Chatham, Ont., Canada

    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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