Question about 2002 Chevrolet Malibu

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Coolant disappearing but no outside leak, water pump replace, rad flushed, theromstat replaced, gauge goes right to overheat blows cold air..????

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  • sherylbevan
    sherylbevan Jan 23, 2013

    Yes it is blowing white smoke all the time,,,I suspected it would be the head gasket, the used car dealership has had it back 4 times, everytime I say head gasket, they replace or fix something else which solves the problem for a day or so then the same thing lets see what they say this time, so far they have fixed or replaced everything else...

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  • 3 Answers

Sounds like a cracked head or bad head gasket to me is it blowing white smoke? O does the exhaust smell like antifreeze.

Posted on Jan 23, 2013

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Posted on Jan 02, 2017

  • 83 Answers

SOURCE: over heating

sounds like an air pocket or waterpump may be on way out.

Posted on Jan 03, 2009

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SOURCE: 2002 Chevy Impala low coolant light is on

I had this same problem with my 2002 3.4L engine impala. Unfortunately, there was a coolant leak at the lower-intake manifold, caused by a cracked gasket. I replaced the gasket, water pump, thermostat, spark plugs and wires and flushed out the heater coil. Didn't find out what it was until after spending 100s on Dex-Cool. I kept refilling it for months until I got a good mechanic to fix the problem whom told me that this is a common repair on older impalas and GM vehicles with 3.4 and 3.1 engines.

Posted on Jul 30, 2009

  • 66 Answers

SOURCE: Truck overheat after thermostat was replaced. Blows cold heat too

Have you checked the coolant to make sure its full.Try this.Run the truck with the radiator cap off and let it warm up.When it reaches normal temps sqeeze the rubber hoses.These hose should be a little hard to squeeze.If they are the thermo and water pump are fine.

Posted on Apr 28, 2009

  • 6982 Answers

SOURCE: 1991 camaro overheating

There are two freeze out plugs at the rear of the block (V8) and many v6 engines. If coolant is coming from where you say, likely they have failed. Unfortunately, the only way to reach them is to remove engine or transmission, It's rare that they fail because they are "protected " by the bellhousing, but can still rot from the inside out. There is no sealer known to man that will fix this. It's a shame that you need to do all that work for a pair of $2.00 plugs, but that's what needs to happen.

Posted on May 23, 2009

  • 401 Answers

SOURCE: 2006 Pontiac Torrent heater blowing cold air

hi
check the heater hoses and if both are hot then the mode door is broken
i have replaced 2 in the torrents(not a nice job)

Posted on Jun 21, 2009

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If your car is equipped with a 3.1 or a 3.4 litre V6 and you have preformed all of the above listed work then I would have to say its the intake manifold gaskets. They commonly blow on these motors. Just a design flaw, nothing but replacing them when they leak can fix this. Also run a coolant pressure test on the system to check for minor things like a leak that you cant see from visual inspection. Hope this helps.

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My 92 Saab 900 blows cold air constantly and the temp gauge stays on low. I replaced the thermostat but still no change. When the heat switch is off for a period of time while driving I can turn the switch...


Unless you have symptoms of over-heating, I rather doubt that your water pump is a problem. I recall that my water pump had a metal impeller (1992 C900); I haven't heard of a plastic impeller on a Saab pump before. (Most pump failures are the bearing seal, and the pump leaks coolant) If your temp gauge is slightly low (and was OK before) I'd rule out water pump issues.

You might have one or more of the following issues:
  1. did you use a Saab thermostat? The Saab stat has three stages (no flow to rad - cold; flow to rad and heater core - normal operation; and no flow to heater core, full flow to rad - overheating) that most after market stats don't.
  2. did you use a low temp stat? this opens at about 82 deg (rather than 89 deg), and will run cooler during the winter, hence you gauge will show lower than the mid point. The big benefit is that your engine won't overheat during the summer (a very good thing!) with the low temp stat.
  3. has your rad and heater core been flushed recently? If the heater core is obstructed flow will be reduced and the heater will run cool. Feel the rad and heater hoses when your engine is warm; if heater hose is much cooler than rad hose with heater temp set to max, then core flow is likely restricted, or valve is not moving much from the shut position.
  4. is you vacuum tank properly connected and are there no leaks in the vacuum piping? The tank is in the driver side rear wheel well below the trunk deck on a convertible, and in the passenger side front fender area on the other cars. It's a white bottle with one or two hoses connected to it. If not properly on, your vacuum operated heater flaps won't move. Does the air distribution knob make sucking or hissing noises when you set it to different positions? If not, check the tank connections, look for vacuum line leaks, then suspect the vacuum valve behind the distribution knob.
  5. Lastly, the shaft connecting the temp control knob to the valve behind it may not be properly in place. This can be inspected, and adjusted if necessary, from the speaker/vent cutout on top of the dash. Make sure you re-connect the black flex hose to the air vent tube, or you'll get no defrosting afterwards!
  6. remember, the centre vents always blow cold air; a brilliant idea from Saab so the driver (and passenger) can get fresh air in the face and stay awake while the rest of the driver, passenger and car is toasty!
  7. see http://townsendimports.com/Web/cooling_system_folder/thermostatreplacement.htm for flushing and stat replacement info

Nov 20, 2009 | 1993 Saab 900

3 Answers

Truck continues to overheat changed water pump and replaced thermostat


You might have a head gasket going south on you,Here is a test you can do to confirm it,Take your overflow line and stick in a clear bottle with water start the engine an see if you have bubbles in the bottle,if not at start up wait till engine gets up to temp and the thermstat is open, if you have bubble you are getting compression in your coolant system,I hope this helps you And thanks

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I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
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Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
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Let your engine warm up with the rad. cap off and see if the coolant level drops. and make sure your overflow is full. It blows cold air because there is no water getting to the heater core. And it shows a normal(ish) temp because the water needs to be touching the temp. sensor. I really do think there is air in the system and there is not enough coolant but hard to tell from here. Also as with overheating any time make sure to check your oil and look for any coolant as the head gasket seldomly holds together if the motor overheats.

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Sounds to me you either needs a theromstat or water pump. Its one of the two.

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