'92 4.9 operating temp

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HT4100 4.1, 4.5, 4.9 Discussion, '92 4.9 operating temp in Cadillac Engine Discussion; Hello all. I was just wondering if anyone knows the proper fan cut-in temps for a 1992 Caddy Seville (STS) ...
  1. #1
    dac675's Avatar
    dac675 is offline Cadillac Owners Member
    Automobile(s): 2006 Stealth Gray CTS-V, 2001 STS
    Join Date
    Mar 2004
    Long Island, New York

    '92 4.9 operating temp

    Hello all.

    I was just wondering if anyone knows the proper fan cut-in temps for a 1992 Caddy Seville (STS) with the 4.9. It seems like the temp frequently ventures up into the high 220's before it starts to cool back down. I haven't had an overheat light, but I just wanted to make sure this is normal and that I am not going to fall victim to a faulty fan switch (temp sensor).



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  3. #2
    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
    Automobile(s): 2005 CTS-V, 1994 Infiniti Q45
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    Jan 2003

    Re: '92 4.9 operating temp

    WHat you are experiencing is complete normal... 220-235 is just fine... 250ish is when you wanna start getting worried..

  4. #3
    JJhomer83's Avatar
    JJhomer83 is offline Cadillac Owners Connoisseur
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    Sep 2003
    Bucks County, Pa

    Re: '92 4.9 operating temp

    4.9L owner and my op. temp is from 192-225

  5. #4
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
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    Dec 2002
    Fort Lauderdale, Florida

    Re: '92 4.9 operating temp

    Perfectly normal.

    Keep in mind that electric fan systems are activated by coolant temp and/or the AC condensor requirements. The AC condensor needs constant airflow over it as the system has little or no thermal inertia...if the AC compressor is running then the fans need to be on ....regardless of engine coolant temp.

    So...in the summer when the AC is on the fans run virtually all the time and as a result the engine temp usually stays right on the thermostat setting.

    But...in the winter, when the AC compressor is not running, the fans will only come on when the coolant temp gets to 220-225 so it is common to see higher coolant temps in the cooler weather then in the summer..and the coolant temps will vary much more in the winter when the AC is not running since the coolant has to heat up to turn the fans on. In the summer when the fans are running most of the time for the AC demand the extra airflow keeps the engine coolant temp fairly steady.

  6. #5
    caddypimp93's Avatar
    caddypimp93 is offline Cadillac Owners Member
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    Apr 2004

    Re: '92 4.9 operating temp

    yeah , ur fine, I have a 93 Seville 4.9 and my temp is usually between 187 and 220 shes never gone past that even under hard driving, so i think ur ok.

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