Question about 1999 Chevrolet Malibu

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Overheating first my temp hand is not reading that the car is overheating.i took it to a garage and it came back boiling. he put a new thermostat in it and said if it overheated again it needed a new radiator.how can i tell if it is the water pump or not. if it runs for about 10 mins it is boiling.he also put green antifreeze in it and said i did not have to use the dex cool. the temp hand stays at about half way all the time. as far as i can tell the radiator is not leaking even though he used stop leak for a leak he said was in the radiator. any help is apreciated thank you

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  • Anonymous Jan 25, 2009

    HELLO CAR BUDS, YA I HAVE ONE 1999 MALIBU AND IT OVERFLOWS THE WATER BOTTLE, I CHANGED EVERYTHING GASKETS,HEAD,MANIFOLD,THERM,RAD,PUMP,ALL THAT GOOD STUFF, AND IT STILL HEATS WHEN I PUT A LOAD ON THE ENGINE THROWS WATER OUT OF THE WATER TANK..LOT'S OF PRESSURE SOMEWHERE, DON'T KNOW CAN YOU HELP...

  • unicornfive Jan 26, 2009

    I have a 1999 Malibu Nice Car Made Very Well-My Problem. It Overflow's At The Surge Tank Or Throw's Water out The Surge Bottle.I Have Replaced Everything Water Pump,Therm,Raid,Gaskets,Head And Manifold,Tore Down The Engine.It Run's Fine It Just Overheat's Because Of This Problem. What Could It Be. Backyard Car guy.

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Alot of times, the symptoms you describe could indicate that you have a lower intake gasket leak. Sometimes it is difficult to diagnose because the temp guage only reads the temp at a specific point and that does not reflect the temp at all points in the motor. I agree with the first suggestion that you shoud run your finger underneath the water pump pulley to see if the weep hole is leaking but it is more likely that you are sucking in air pockets through your intake gasket. Check the valley underneath your air inlet (on the top of the motor) for coolant. And also, green (glycol) based coolant has been known to damage aluminum radiators.

Posted on Oct 17, 2008

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0k moon wizard, is the water pump leaking? There is a 'weep hole' under the pump. When it is on the way out (needs replacement) it will start to leak antifreeze there, and it will get worse. If u can get a small mirror and look under the center of the pump, it would be obvious if it was leaking or not. If the pump is going bad, u will see the leak, or evidence of it (corrosion, an obvious path of the leak, actual antifreeze leaking. If the pump isn't leaking or making a lot of noise (bearings shot), then it's not the water pump. There is antifreeze manufactured now that will work in GM (dex cool) vehicles and all others (the green stuff). If u don't see an actual leak, the thermostat was installed properly, the gauge shows it's in the normal zone, I'd have the temp sending unit checked since it's apparently not working properly, and that leaves the radiator. It probably is the problem, it could be plugged up w/ rust and corrosion, which would diminish the cooling ability. Let me know what u find. countrycurt0

Posted on Oct 11, 2008

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