2001 SLS --- after fifteen minutes it tries to run hot
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 2001 SLS --- after fifteen minutes it tries to run hot in Past Cadillac Vehicle Discussion; I bought a 2001 SEVILLE SLS and it tends to over heat after 15 minutes of driving... It has a ...
  1. #1
    BigCla2 is offline Cadillac Owners Member
    Automobile(s): 2001 SLS Seville
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    2001 SLS --- after fifteen minutes it tries to run hot

    I bought a 2001 SEVILLE SLS and it tends to over heat after 15 minutes of driving...
    It has a new WATER PUMP, THERMOSTAT, and a 7 MONTH OLD NEW RADIATOR.

    Will someone help me and explain to me 'Step-by-Step' on what to do on how to fix it (Video preferably).

    This is my first car and I don't know ANYTHING about cars. So if you do choose to help, Give your instructions fairly detailed.

    ---- Thanks a billion!

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  3. #2
    4theheels is offline Cadillac Owners Member
    Automobile(s): 2001 Eldorado ETC
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    Re: 2001 SLS Seville --- AFTER FIFTEEN MINUTES IT TRIES TO RUN HOT. (HELP!)

    Let's hope your head gasket is not the problem. Check: http://www.northstarperformance.com/hgfaq.php to check for the most common symptoms.
    NAPA also sells a combustion leak test kit part # BK 700-1006.
    good luck.

  4. #3
    mike5514 is offline Cadillac Owners Enthusiast
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    Re: 2001 sls --- after fifteen minutes it tries to run hot

    Remove your purge line run engine and check for flow it is the rubber hose going into the surge tank coming from the engine. This is the fastest easiest check and if the line does not flow that is likely the problem but being used and previous work done you will like 4theheels says need the block test done correctly .Mike

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
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    Re: 2001 sls --- after fifteen minutes it tries to run hot

    Welcome aboard, but likely under VERY expensive circumstances.

    First things first: Do you thoroughly understand the Northstar cooling system and fan control sequence, what is actually "hot" for this car, and how the HVAC control settings affect cooling fan operation ?

    Fan circuit for your car in my albums.

    If so, and you are certain that the engine is, in fact, overheating, then...........

    The radiator, water pump, and thermostat are/were probably not the problem with the car. Chances are that someone unloaded the car because the head gaskets are failing.

    Go up ^^^ to the top black bar and read the entire Cadillac Technical Archive, especially the articles on coolant, maintenance, oil consumption, and engine operation. Then go down to Discussions, Cadillac Tech Tips and go through the several pages of threads for articles of interest - head gasket replacement, block inserts or studs. (depending on how you or someone else does the work, this is a $2,000 to $4,500 job.) Now go to Engines, Northstar Performance and read the link that 4theheels provided, plus the other Northstar sticky posts at the top of the first threads page in the forum. You will find several head gasket replacement threads with pictures.

    Either go to a large car parts chain store and rent a "cylinder block exhaust gas test set" or use this site. www.sjdiscounttools.com/lis75500.html
    Follow the directions explicitly.

  6. #5
    CARLOSJ1939 is offline Cadillac Owners Member
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    Re: 2001 SLS --- after fifteen minutes it tries to run hot

    check the radiator fans see if they are working, if not then check the fuses & relays, could be just a simple fuse blown, but then again if its blown then it could be one of the fan motors is not working. good luck.

  7. #6
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
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    Re: 2001 SLS --- after fifteen minutes it tries to run hot

    Quote Originally Posted by CARLOSJ1939 View Post
    check the radiator fans see if they are working, if not then check the fuses & relays, could be just a simple fuse blown, but then again if its blown then it could be one of the fan motors is not working. good luck.
    BigCla2, In your car, any time you have an A/C or DEFROST function set in the HVAC system the cooling fans (both) should run in SLOW. In this weather, with no A/C function set, fans go to SLOW at 224 degrees, the engine cools to 213, fans shut off and the cycle starts over.

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