Losing coolant, no visible leaks.... long description - Page 2

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Cadillac Seville / Cadillac Eldorado Forum Discussion, Losing coolant, no visible leaks.... long description in Past Cadillac Vehicle Discussion; Originally Posted by Submariner409 You have said there IS a coolant surge tank, that the "radiator cap" is not on ...
  1. #16
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Cadillac Eldorado ETC
    Join Date
    Aug 2010
    Kennewick WA

    Re: Losing coolant, no visible leaks.... long description

    Quote Originally Posted by Submariner409 View Post
    You have said there IS a coolant surge tank, that the "radiator cap" is not on the radiator itself.

    The proper level of coolant in that surge tank is half full, cold. The surge tank is part of the pressurized system - there is no "coolant overflow bottle" or "coolant expansion bottle" as in older, obsolete coolant recovery systems.

    You overfill that surge tank, and as the coolant expands normally during warmup, it WILL bleed off coolant. Half full, cold.

    Is there a legend molded into the top/side of the surge tank "FULL COLD" with a flat line/arrow going over and down the side to about the mid-seam ???

    200 degrees running temp is perfect - right in the midle of the desired 188 - 210 range.

    Zoom in on this page from the 2002 service manual - the surge tank - see the number 1 and line to the tank mid-seam ??? That's the proper cold fill level. (The Note on supplements is deleted and obsolete)

    Also note some Eldorados (like mine) have an opaque black surge tank so use best judgement.

  2. #17
    cliff77 is offline Cadillac Owners Member
    Automobile(s): 93 sts
    Join Date
    Feb 2013
    nashville tn
    The surge tank is black in mine. Hard to tell where the cold fill line is.
    I will update at the end of the week

  3. #18
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    MD Eastern Shore - Kent Island

    Re: Losing coolant, no visible leaks.... long description

    ............. wing it.

  4. #19
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Losing coolant, no visible leaks.... long description

    Use a piece of dowel rod as a make shift dip stick.

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