Coolant Questions
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HT4100 4.1, 4.5, 4.9 Discussion, Coolant Questions in Cadillac Engine Technical Discussion; I have a couple concerns about both of my 89's coolant. The sedan has been having air bubbles in the ...
  1. #1
    derrty_deville's Avatar
    derrty_deville is offline Cadillac Owners Enthusiast
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    Coolant Questions

    I have a couple concerns about both of my 89's coolant. The sedan has been having air bubbles in the colant once its driven long enough to fill the resevoir. It looks almost like boiling water. Should I start looking towards the intake gaskets?

    Now while I was out replacing a few little things on the new coupe I opened the radiator cap and noticed the coolant level was low in the radiator but the overflow tank was pretty full. I think I'll be taking this one to work tommorow so I can check for the power steering leak so I'll keep an eye on that too. It was fine when I bought the car Saturday.

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  3. #2
    HUF's Avatar
    HUF
    HUF is offline Cadillac Owners Connoisseur
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    Re: Coolant Questions

    Quote Originally Posted by derrty_deville View Post
    I have a couple concerns about both of my 89's coolant. The sedan has been having air bubbles in the colant once its driven long enough to fill the resevoir. It looks almost like boiling water. Should I start looking towards the intake gaskets?

    Now while I was out replacing a few little things on the new coupe I opened the radiator cap and noticed the coolant level was low in the radiator but the overflow tank was pretty full. I think I'll be taking this one to work tommorow so I can check for the power steering leak so I'll keep an eye on that too. It was fine when I bought the car Saturday.
    The hose which connects the reservoire to the radiator could be plugged. The radiator side tanks are know to crack , they are plastic. Look for traces of coolant on them.

  4. #3
    carnut is offline Cadillac Owners Master
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    Re: Coolant Questions

    If the radiator cap itself is weak it wont cause a vacuum to pull coolant from the tank. Have it tested. Intake gasket leaks leave a light brown milky residue under the oil filler cap usually. First thing to ck is to pressure test the cooling system with the engine stone cold then again at normal temperature and report back.

  5. #4
    derrty_deville's Avatar
    derrty_deville is offline Cadillac Owners Enthusiast
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    Re: Coolant Questions

    Now that I think of it the Radiator cap seal was broken. I'll get that replaced and see if that will clear it up.

    Both cars have air bubbling in the tank after I turn the car off. Is this something I need to sweat?

  6. #5
    thu's Avatar
    thu
    thu is offline Cadillac Owners Connoisseur
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    Re: Coolant Questions

    I'd say replace the cap first before you worry about other symptoms. Coolant is the hottest just after the engine is shut down. So, don't worry about that right now. Replace the cap, then see if the bubbling continues.

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