Normal??
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HT4100 4.1, 4.5, 4.9 Discussion, Normal?? in Cadillac Engine Technical Discussion; i have owned many N* but never a 4.9L what is the normal Coolant Temp on a 92 ELDO? I ...
  1. #1
    molotovman5000 is offline Cadillac Owners Fanatic
    Automobile(s): 01 deville
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    Normal??

    i have owned many N* but never a 4.9L what is the normal Coolant Temp on a 92 ELDO? I know N* are 192-224 but dont know about 4.9L thanks.

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  3. #2
    thu's Avatar
    thu
    thu is offline Cadillac Owners Connoisseur
    Automobile(s): 2003 STS w/BoseNav, 1993 Deville, 1985 Deville
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    Re: Normal??

    According to the 1993 Deville (4.9L) FSM, the thermostat opens between 192*F and 199*F (89*C - 93*C). The thermostat fully opens at 219*F (104*C).

    The fans are commanded to go to low speed when the coolant reaches 98*C (208*F). High speed is commanded when the coolant reaches 106*C (226*F) or when the A/C refrigerant temp reaches 100*C (212*F).

    The "Coolant Temp" light comes on when the temp reaches 125*C (257*F).

    So, in summary, you should see temps similar to a Northstar.

  4. #3
    molotovman5000 is offline Cadillac Owners Fanatic
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    Re: Normal??

    ok thanks, I do apologize for posting it on the wrong forum... I swear i put it on the 4.9L board lol

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Normal??

    I'll move it for you.

  6. #5
    kdcing is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldorado, 4.9L, 200k miles
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    Re: Normal??

    My '93 Eldorado w/ 4.9L typically stabilizes around 199-201F, per the digital/electronic readout on the dash. The thermostat has been replaced w/ the OEM temp rated replacement.

  7. #6
    STSAllan is offline Cadillac Owners Member
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    Re: Normal??

    Hello,

    I have been looking around the net for the answer to this exact question. We just purchased a 1992 STS, and I wanted to make sure at what temp we should get concerned. The person who sold it to us was a service advisor at a local repair shop, and he told my wife if it reached 220 degrees pull over and let it cool down.

    While I respect his knowledge, it seemed to me that 220 wouldn't warrant having to pull over. It has reached this temp a few times, with no smells, noises, that one might expect from overheating.

    I would truly appreciate if someone might be able to tell me what I might want to look for as far as temps under normal conditions in SoCal.

    Thanks in advance!

    Allan

  8. #7
    chazglenn3's Avatar
    chazglenn3 is offline Cadillac Owners Connoisseur
    Automobile(s): 2005 White Diamond STS N* 1SF RWD ACC/HUD
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    Re: Normal??

    My 91 STS seems to be perfectly happy and stable around 209*-214* according to the driver information center.

  9. #8
    thu's Avatar
    thu
    thu is offline Cadillac Owners Connoisseur
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    Re: Normal??

    My Deville hit 226*F (106*C) all the time. It did that for 300,000 miles.

  10. #9
    awadecki is offline Cadillac Owners Enthusiast
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    Re: Normal??

    220 is not a problem for these cars. Most new cars run hotter than that in stop and go traffic. The low speed fans on the 92 Seville won't even kick on until about 225 degrees F.

    My 92 STS runs at about 198 on the freeway, or when I'm driving it at a speed that's actually cooling off the radiator. In very bad stop an go traffic it'll hit 225 all the time, then go down to about 215 where the fan kicks off, but it never gets above 235 (I think the high speed kicks on at about 230 or so).

    I'd say if you hit 240-245 you should pull over and shut it off. That's too hot.

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