1989 Brougham water leak...
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5.0 and 5.7 Discussion, 1989 Brougham water leak... in Cadillac Engine Technical Discussion; Hey guys, I fired up my 89 Brougham (w/ olds 307, 5.0) today and noticed a massive water/anti-freeze leak. The ...
  1. #1
    AElayyat's Avatar
    AElayyat is offline Cadillac Owners Connoisseur
    Automobile(s): 85 Fleetwood Brougham, 90 Brougham 5.7, 05 Deville DTS
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    1989 Brougham water leak...

    Hey guys, I fired up my 89 Brougham (w/ olds 307, 5.0) today and noticed a massive water/anti-freeze leak. The leak was coming from the pass. side rear of the engine. I did not get a chance to pressure test the cooling system to pinpoint the leak, but was wondering what in that area can cause loss of coolant? A hose, freeze-plug (which I hope is not the case), etc...

    Thanks in advance for the help fellas.

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  3. #2
    joe_padavano is offline Cadillac Owners Member
    Automobile(s): 93 Allante
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    Re: 1989 Brougham water leak...

    Quote Originally Posted by AElayyat View Post
    Hey guys, I fired up my 89 Brougham (w/ olds 307, 5.0) today and noticed a massive water/anti-freeze leak. The leak was coming from the pass. side rear of the engine. I did not get a chance to pressure test the cooling system to pinpoint the leak, but was wondering what in that area can cause loss of coolant? A hose, freeze-plug (which I hope is not the case), etc...

    Thanks in advance for the help fellas.

    The problem is almost certainly the heater valve located at the rear passenger side of the intake manifold. I replaced mine last summer for $18 from Advanced Auto Parts. Be very, very careful not to bend or distort the vac diaphragm housing during installation, as this will lead to premature failure (don't ask me how I know this). The hex size is 1 1/16". The proper tool is a crow's foot wrench. The next best choice is to get an old open-end wrench, heat it, and bend it to clear. I used a very large adjustable wrench, which is what caused the damage the first time.

  4. #3
    AElayyat's Avatar
    AElayyat is offline Cadillac Owners Connoisseur
    Automobile(s): 85 Fleetwood Brougham, 90 Brougham 5.7, 05 Deville DTS
    Join Date
    Feb 2004
    Location
    So. Cali
    Age
    32
    Posts
    1,094

    Re: 1989 Brougham water leak...

    Quote Originally Posted by joe_padavano View Post
    The problem is almost certainly the heater valve located at the rear passenger side of the intake manifold. I replaced mine last summer for $18 from Advanced Auto Parts. Be very, very careful not to bend or distort the vac diaphragm housing during installation, as this will lead to premature failure (don't ask me how I know this). The hex size is 1 1/16". The proper tool is a crow's foot wrench. The next best choice is to get an old open-end wrench, heat it, and bend it to clear. I used a very large adjustable wrench, which is what caused the damage the first time.
    Thanks for the suggestion joe. I'll look into the valve. Today I pressure tested the system while the car was running, and not a single drop of water! The raditator was full, coolant res. is like 1/4 full. I did see a lot of water sitting on the intake manifold??? Any other ideas???

    Thanks.

  5. #4
    joe_padavano is offline Cadillac Owners Member
    Automobile(s): 93 Allante
    Join Date
    Mar 2006
    Location
    Northern Virginia
    Posts
    78

    Re: 1989 Brougham water leak...

    Quote Originally Posted by AElayyat View Post
    Thanks for the suggestion joe. I'll look into the valve. Today I pressure tested the system while the car was running, and not a single drop of water! The raditator was full, coolant res. is like 1/4 full. I did see a lot of water sitting on the intake manifold??? Any other ideas???

    Thanks.
    This is exactly how my 307 behaved when the valve went bad. Change it.

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