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Thread: 1998 ESC coolant question

  1. #1
    eldorado_sean's Avatar
    eldorado_sean is offline Cadillac Owners Enthusiast
    Automobile(s): 98' Eldorado ESC
    Join Date
    Sep 2012
    Burbank, California

    1998 ESC coolant question

    Should I drain or flush my coolant and what other products are used besides the coolant itself and I'm using prestone 50/50 mix with distilled water. And could anybody walk me through the steps of doing it?

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
    Join Date
    Sep 2010
    East Boston MA.
    No need for a flush unless there's a blockage, or you're trying to flush out a stop leak product.

    No other products recommended or necessary, just coolant.

    Open the petcock on the radiator, drain the coolant, fill with new coolant. Correct coolant level is to the FULL COLD line on the surge tank, about half way up, where the two tank hands meet.

    Keep an eye on the coolant level for the first few drives/days, add if necessary.

    Drain and fill every 2 years, 3 max.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: 1998 eldorado esc coolant question

    After the initial fill, before you even cap it up, rev it to 3K and hold it there for 30 seconds or so to purge any air in the system. Then top it off and cap it up, but follow MC's advice and check it again after the next 2-3 drives. It could still need a top off.


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