Is this normal?
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Is this normal? in Past Cadillac Vehicle Discussion; Greets, Been noticing that after cruising down the interstate at around 80mph for about 45 minutes and then pulling into ...
  1. #1
    DJSG3 is offline Cadillac Owners Fanatic
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    Is this normal?

    Greets,

    Been noticing that after cruising down the interstate at around 80mph for about 45 minutes and then pulling into town traffic (stop and go stuff) the temperature gauge will move from the center position to the next hotter point on the gauge for a few minutes before returning to the center position. Is this normal or should I be checking on something like say the fan? This would be in the 2003 DTS.


    DJSG3

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    A needles width or less past 12:00 is fine. To the next line, something's up.

    The usual checks - coolants ELC, purge line clear, WP drive system.

    Fans will only make a difference when stopped, or driving below ~25 MPH or so.

  4. #3
    DJSG3 is offline Cadillac Owners Fanatic
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    Re: Is this normal?

    Quote Originally Posted by MoistCabbage View Post
    Fans will only make a difference when stopped, or driving below ~25 MPH or so.

    That's when it does it. I'll come off the freeway to a stop and then it heats up. I start moving again and it calms down and it only does it after beating on it for a while, quick trips around town no problem - just in the long hauls.

    DJSG3

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Is this normal?

    These gauges are so dampened they never move (at least mine never does). It's not "normal", but it doesn't sound like anything to be concerned about either (unless it gets worse).

    P.S.
    Define "beating on it".

  6. #5
    carnut is offline Cadillac Owners Master
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    Re: Is this normal?

    Replace the cooling system pressure cap with a DELCO one and report back.

  7. #6
    reppinshadyvill is offline Cadillac Owners Fanatic
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    Re: Is this normal?

    Mine has done that for the last 20k miles. I attribute it to the fact that on the highway you have substantially more airflow through the rad and when you abruptly change to city traffic after getting off, the fans will have to try and catch up. I also do about 70-85 mph average on the highway for about a 30 min stretch each way from work.

  8. #7
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Is this normal?

    You pull off the highway after a decent 75 mph run and everything associated with the engine guts is WARM. The only fluid that cools the entire reciprocating machinery package is engine oil. You slow down, idle, and a LOT of latent heat migrates to the heads and block: The cooling system dutifully does its job, fans may go to SLOW, the circulating coolant removes the heat and transfers it to the radiator. Normal.

  9. #8
    DJSG3 is offline Cadillac Owners Fanatic
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    Re: Is this normal?

    Okie doke, thanks for the inputs was wondering because I've never seen the Seville do this, just the Deville.
    Oh and "beating on it" to me means even though the freeways busy ain't nobody trying to pass me

    DJSG3

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    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Is this normal?

    Try the test both ways - with some A/C function (compressor run) set, the cooling fans always run in SLOW. With the HVAC system in ECON or OFF then fans are only controlled by the ECT system - SLOW at 224 (about the 1st tick mark) and FAST at 236. IF fans go to SLOW the engine cools to 213, fans shut OFF and the cycle repeats.

    Sooooo......... With the HVAC set to some cooling cycle the gauge should be fairly constant around 12 o'clock. With no HVAC set, the gauge will move as the engine heats and cools in response to fan operation.

  11. #10
    Ranger's Avatar
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    Re: Is this normal?

    Quote Originally Posted by DJSG3 View Post
    Oh and "beating on it" to me means even though the freeways busy ain't nobody trying to pass me

    DJSG3
    That ain't beating on it. Look at the tach. Hell, it's just lopping along (probably around 2500 RPM). "Beating on it" would be some good ole WOT.

  12. #11
    DJSG3 is offline Cadillac Owners Fanatic
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    Re: Is this normal?

    Quote Originally Posted by Submariner409 View Post
    Try the test both ways - with some A/C function (compressor run) set, the cooling fans always run in SLOW. With the HVAC system in ECON or OFF then fans are only controlled by the ECT system - SLOW at 224 (about the 1st tick mark) and FAST at 236. IF fans go to SLOW the engine cools to 213, fans shut OFF and the cycle repeats.

    Sooooo......... With the HVAC set to some cooling cycle the gauge should be fairly constant around 12 o'clock. With no HVAC set, the gauge will move as the engine heats and cools in response to fan operation.
    The HVAC is always set to AUTO with a temp somewhere in the 70s unless its really hot or cold outside. So reckon I'll try with it off and see what happens, maybe it just needs new coolant. Just got the car about a month ago and haven't discovered all of its needs or abuses yet. So far though everythings coming up roses except for this cooling thing and a heater door/actuator that doesn't wanna work. Any chance the two are connected? Don't think so but ya never know.

    DJSG3

    ----------

    Quote Originally Posted by Ranger View Post
    That ain't beating on it. Look at the tach. Hell, it's just lopping along (probably around 2500 RPM). "Beating on it" would be some good ole WOT.
    For me too maintain 80mph for 45 minutes in my neck of the woods means a lot of WOTs. Them peons in their rice burners just don't magically move out of the way ya know

  13. #12
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Is this normal?

    Quote Originally Posted by DJSG3 View Post
    The HVAC is always set to AUTO with a temp somewhere in the 70s unless its really hot or cold outside. So reckon I'll try with it off and see what happens, maybe it just needs new coolant. Just got the car about a month ago and haven't discovered all of its needs or abuses yet. So far though everythings coming up roses except for this cooling thing and a heater door/actuator that doesn't wanna work. Any chance the two are connected? Don't think so but ya never know.

    DJSG3
    No..

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