4.9 Heating Up?
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 4.9 Heating Up? in Past Cadillac Vehicle Discussion; Hey again everyone. I drove my Eldorado about 50 miles today and only stopped one time at an ice cream ...
  1. #1
    J.D.Hogg's Avatar
    J.D.Hogg is offline Cadillac Owners Member
    Automobile(s): 1991 Eldorado, 1987 DeVille, (R.I.P), 1980 DeVille, (R.I.P.)
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    4.9 Heating Up?

    Hey again everyone. I drove my Eldorado about 50 miles today and only stopped one time at an ice cream stand and that was it. I always check the temperature gauge and I glanced down at it as I was turning on to my street and it read 230 degrees. I shut off the motor and drifted it down my street and into my driveway to avoid any possible damage. The car always reaches 224 degrees and then cools down. Why is it getting that hot? It is 89 degrees outside and the air conditioner was running the whole time. I opened the hood and the coolant was bubbling into the reservoir and was almost to the top. Now it has settled down to the hot mark. I am afraid to drive it again without finding the source of the problem. It did the very same thing 2 months ago. I shut the car off where it was at, left it cool for 1/2 and hour and drove it home with no air conditioning on and everything was fine since then. The gaskets, water pump, coolant, and thermostat are all less than 3 months old. After the incident today, I waited 15 minutes and turned the key on and it still read 230 degrees. I started the car and the fans came on right away and cooled it down quickly. Do I have some kind of electrical problem with the fans?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 4.9 Heating Up?

    coolant was bubbling into the reservoir
    Time for a block test, but you might try testing or replacing the radiator cap first.

  4. #3
    N*Caddy's Avatar
    N*Caddy is offline Cadillac Owners Master
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    Re: 4.9 Heating Up?

    What's so unusual about 230*F?

  5. #4
    J.D.Hogg's Avatar
    J.D.Hogg is offline Cadillac Owners Member
    Automobile(s): 1991 Eldorado, 1987 DeVille, (R.I.P), 1980 DeVille, (R.I.P.)
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    Re: 4.9 Heating Up?

    Thanks for the help Ranger. I will definitely try that tomorrow and see how everything works out.

  6. #5
    EldoRedo's Avatar
    EldoRedo is offline Cadillac Owners Fanatic
    Automobile(s): 1991 ETC (Crimson)
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    Re: 4.9 Heating Up?

    N*Caddy is right -- the normal coolant operating temperature is between 185 degrees and 230 degrees, so on a hot day with the A/C on -- plus you presumably slowing down on your street -- that should not be an alarming reading at all. The A/C compressor clutch will not disengage until you hit 260 degrees -- and that's just to protect the engine in stop-and-go traffic (which would also set a code B450). So the engine will be fine until upwards of 260 degrees.

    It also sounds from your description that you may have too much coolant? It should obviously be at the FULL HOT level mark when you shut it off -- then it should drop down to the cold level after an hour or two.

  7. #6
    pocketpared is offline Cadillac Owners Fanatic
    Automobile(s): 1992 Eldorado
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    Re: 4.9 Heating Up?

    My 92 4.9l has been running up to 230 - 232 on occasion during warm weather since I bought it 4 years ago. As said earlier, usually when slowing down. Never been a problem. So far.

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