Question about 1999 Oldsmobile Alero

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1999 olds alero leaking coolant

I have a 1999 olds alero that is leaking coolant pretty bad, i replaced the head gaskets got my heads measured and everything they were fine. i also replaced the valves, intake gasket, valve gaskets, and all the other gaskets in the enigne, got a new thermostat, new water pump, and my car is still leaking coolant and i took it into 3 different mecahnic shops and nobody can find out the problem. i would just junk the car but i have about $15,000 under the hood and its my racing car and i had it since it was brand new.. so anybody got any suggestions please help me......

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  • tlfoss Jan 22, 2009

    I am dealing with the same damn problem!! I am so sick of dealing with it I as well just want to junk it!

  • Rob Houg
    Rob Houg May 11, 2010

    This may sound silly to you as you have done all the previous work. But have you checked the hoses.

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Problem could be heads bolts . i put new bolts in put a little sealer on them . make sure your bolt holes is clean free from debris. put a lillte sealer on intake gasket on top and bottom where coolants travel. if all was done . drain engine oil in clean container .set it aside. take radiator cap off .you a coolant pressure rise kit .put a pan under oil pan with drain plug still off .pressure your radiator about 10 psi. make sure you have antifreeze in radiator and engine . when you pressure up to 10 psi look under the car if coolant comes out oil pan. you got leaking head gasket. if not .put oil pan plug back on . put oil back in car . check your freeze plugs also.

Posted on Mar 17, 2009

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  • Expert
  • 125 Answers

Try pressurizing the system using tester might even be something simple like radiator cap or leaky heater core.

Posted on Feb 26, 2009

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1 Answer

Is it time to junk 1999 alero 135k miles?


Where is the gallon of 50/50 going if no leaks and apparently not into the oil? Is it going out the exhaust which would be a bad Head gasket failure? So Some boil over due to overheat? Take the coolant tank cap off then start the car and see if bubbles, maybe steam eventually. If bubbles, they are probably the leaking combustion gases leaking through the Head gasket. Sometimes, retorque of the head bolts will slow the leak down. Otherwise need gasket replacement and possible head mill if it has "warped" or Junkyard heads that are good. You can confirm head gasket leak and location by a leak down test. You may be able to borrow tools from some of the auto parts stores. Have you used "leak stop" in the radiator? Sometimes that will block radiator cooling channels and cause overheating. Hopefully, that is the issue and a radiator replacement the fix. Could be a bad water pump, but if you get heat that is probably not the problem. I did that to a Chrysler many years ago and wife's car! Hope this helps.

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1 Answer

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2 Answers

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not a complete history in your brief 'sentence', but water from the exhaust is either condensation whick is normal, or you have a blown head gasket or worse (cracked head or block) which is going to be very expensive to fix. If it is not overheating too, you have nothing to worry about, if it is you need to get the car to someone who can do a compression test and cylinder and/or coolant leakdown test to determine the extent of the damage.

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2 Answers

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1 Answer

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1 Answer

1999 Alero


check the entire engine freeze plugs hoses radiator . check engine oil .if look like milk shake you got a blown head gasket. if it dont burn oil dont smoke . fix the leak . if it got 150000 or more . cost to much to fix buy another engine.

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