How to R & R ’99 Deville Radiator

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  1. #1
    Lew Shaw's Avatar
    Lew Shaw is offline Cadillac Owners Member
    Automobile(s): 08 DTS Luxury II Biarritz
    Join Date
    Aug 2008

    SmileHow to R & R ’99 Deville Radiator

    Hopefully this will help someone else that needs to R&R their radiator.

    Disconnect battery.
    Remove 3 plastic allen head screws and pull off the black plastic cover over radiator header and headlights.
    Disconnect wire and remove air cleaner box (pull up on end of box to free from rubber grommets).
    Remove radiator cap and drain radiator (can cut lower hose to drain, if necessary).
    Remove upper radiator hose (not necessary to remove lower hose from the radiator).
    Disconnect wires from both fans and remove the 2 bolts from top of each fan that hold it to the header and lift fans out (held in at bottom by slotted rubber grommets).
    Disconnect transmission cooler lines and plug lines.
    Remove 7mm machine screw that holds A/C line bracket to driver’s side of radiator (hardest part of the job!).
    Remove the two bolts that hold the electrical gizmo in the center of the radiator header and move it out of the way.
    Remove the 3 bolts the hold the radiator header to the body and remove the header.
    Remove 6 bolts that hold A/C condenser end brackets. There is one on the top of each end of the radiator and four on the front of the condenser. Lift and wiggle those brackets out (they have a tang that slips down into slots on each side of the radiator).
    Lift out radiator. (note: good time to replace the front motor mount, if necessary).
    Run water through the new radiator to flush it out, remove transmission cooler plugs, screw 7mm machine screw into boss on side of radiator to cut threads and then remove screw (makes it much easier to install later).

    Reinstall everything in reverse order of these directions.

    It is easier to replace all the GM hose clamps with aftermarket that you can tighten with a screw driver. If you insist on using the GM clamps, install the lower hose to the new radiator before installation.
    Don’t forget to add at least 3 stop leak pellets (I crushed mine and poured them into the bottom hose) and it should take right at 2 gallons of 50/50 mix Dex-Cool coolant.
    Run engine until warm, check for leaks and after cooled down (next day) check coolant level.

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  3. #2
    Bosco Murphy's Avatar
    Bosco Murphy is offline Cadillac Owners Member
    Automobile(s): 99 Cadillac Deville & 04 CTS
    Join Date
    May 2007
    Boston, Ma.

    Re: How to R & R ’99 Deville Radiator

    Good info here! Exactly what I was looing for. My left side fan is not working and I have to take it out and replace.


  4. #3
    TexasGuy is offline Cadillac Owners Member
    Automobile(s): Deville 97
    Join Date
    Jul 2010

    Re: How to R & R ’99 Deville Radiator

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  6. #4
    contours99 is offline Cadillac Owners Member
    Automobile(s): deville contour 1999
    Join Date
    Feb 2011
    Tucson, AZ

    Re: How to R & R ’99 Deville Radiator

    Thanks for sharing. I am going to attempt to change the radiator on my 99 Deville Concours.


  7. #5
    sacvo1999 is offline Cadillac Owners Member
    Automobile(s): Mac and Betty silver and pearl 99 devilles
    Join Date
    Jul 2012
    Q.C. AZ

    Re: How to R & R ’99 Deville Radiator

    what if you have a base model and you got a radiator with four ports on it instead of two?

  8. #6
    Eninety2 is offline Cadillac Owners Fanatic
    Automobile(s): 99 Deville
    Join Date
    Jun 2011

    Re: How to R & R ’99 Deville Radiator

    Why should we put stop leak pellets in a new radiator?

  9. #7
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: How to R & R ’99 Deville Radiator

    GM discontinued their use back in 2003 - 2004 or so. If you have no nuisance weeps or had no leaks in the cooling system before whatever caused cooling system repair, there's no real sense in installing more goop in the system.

    The tablets were installed to prevent nuisance weeps resulting in warranty comebacks, and for no other reason.

    The tablets are Bar's Leaks #HDC and the equivalent powder is Bar's Leaks #G12BP.

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