Coolant Leak
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HT4100 4.1, 4.5, 4.9 Discussion, Coolant Leak in Cadillac Engine Technical Discussion; I recently purchased an '87 Sedan Deville. The car is is in pristine codintion. Only 39,000 original miles. I have ...
  1. #1
    pwbtexan is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jul 2008
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    Cool Coolant Leak

    I recently purchased an '87 Sedan Deville. The car is is in pristine codintion. Only 39,000 original miles. I have discovered that there is a coolant leak. The local Firestone repair shop looked it over and told me that I need to replace the intake manifold gaskets. Although the car has extremely low miles, I'm told that age is the problem. The repair is estimated at about $1000. Has anyone tried any of the Bars Leak chemicals? Just curious how effective these might be.

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Feb 2003
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    california
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    Re: Coolant Leak

    Do not drive this car until the gaskets are changed. Intake coolant leaks will quickly wipe out the cam and lifters. And, yes its age and lack of timely coolant replacements that cause this. Make sure after replacement that the GM sealant is used. Part no. is on the white decal on the radiator support. Stop leak, Barsleak are NEVER permanent repairs, they allow you to get home so it can be done correctly! Once fixed, coolant MUST be changed at 2 year intervals.

  4. #3
    noahsdad's Avatar
    noahsdad is offline Cadillac Owners Connoisseur
    Automobile(s): '87 SDV
    Join Date
    Jun 2005
    Location
    Michigan
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    55
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    Re: Coolant Leak

    This is probably the most common major failure item on the 4100. Mine went at 19k, directly attributable to neglect of changing the coolant and not using the GM sealer.

    If you follow carnut's advice, you'll be okay. Spend the grand, and enjoy a nice luxury car for years to come.

  5. #4
    gmp428's Avatar
    gmp428 is offline Cadillac Owners Member
    Automobile(s): 1992 Cadillac Brougham
    Join Date
    Jan 2008
    Location
    Chicago, IL
    Posts
    21

    Re: Coolant Leak

    dude i had the same exact problem. while repairing i figured i might as well do the head gaskets while im there. which is a PITA. i ended up stripping 3 head threads, and finding the correct tools to repair them, ie, drill bits, insert tools, and inserts was absolutely ridiculous. and then i ended up stripping a rocker arm pivot bolt, and breaking a rocker arm pivot. my advice to u is to take your time and be very careful if you attempt to do this repair yourself. each set of bolts i took out i put in a ziplock bag and marked on the bag where they came from cuz im still working on it on and off for 3 months and had i not marked them i would have no idea where they go. with the amount of time and money ive spent doing this myself i could have had it repaired and the dealership and have some sort of a guarantee that everything will be working alright. best of luck to you!!!

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