Question about 2003 Chevrolet Malibu

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2003 malibu was overheating so replaced thermostat sensor and now we get no heat.

Have replaced head and intake gaskets, thermostat....it was overheating but when idling got great heat but when driven would overheat so replaced thermostat sensor which fixed the overheating but now we get no heat???any ideas??

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  • 249 Answers

What is your model number is then we can get started then

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

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SOURCE: overheat, excessive preasure build up in cooling system

Have you changed the water pump ?

Posted on Jan 18, 2010

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SOURCE: I have a 1997 Chevy Malibu that is over-heating.

if you do not turn the a/c on, do the fans cycle? turning on the a/c will signal fan demand - this indicates the the fan and circuits are OK. if the fan cycles with the a/c off, we can move away from a fan issue. if not, look into that. have you tested the rad cap? i believe this model has one cap on the expansion tank and no rad cap, if i remember correctly. i have actually run into one of these cars where an incorrect cap was installed, causing similar symptoms. it sounds as if you know what you are doing, but is there any possibility that there is an air lock in the cooling system? if there is heat coming out of the vents when the car is hot, there is probably no issue there, and also likely means the waterpump is ok. let me know and we'll talk later if necessary, good luck!

Posted on Apr 02, 2010

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My grand am still overheats even after i changed the termostat and water pump plus, the fan only runs when the temp sensor is unplugged


I had the same problem with my 1999 grand am .I changed water pump, thermostat. I heard the Pontiac engines , 3.4 had overheating problems one is the intake gasket if your losing water but don't know were its going its leaking at the intake gasket and burning off or if you check the oil cap or the dip stick and theres a milky substance on them it would be your head gasket I had to change my head gasket and while I was there I changed the intake gasket too. I haven't had any problems sence I changed them hope this helps. Jack

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2003 chev malibu looses coolant and heats up i can't find any leaks getting po452 code


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The Engine Temp. sensor is bad. it is under the intake manifold. if there is a miss also check under the coils over the spark plugs. If there is Coolant in the spark plug holes .then the intake gasket is leaking. The intake manifold needs to come off to change the coolant sensor. When off look for corrosion on the cylinder head at the coolant port. If there is corrsion then the cylinder head must be replaced.

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Over heating 2002 Aztek First mechanic we took it to: replaced intake manifold and water pump, flushed system because dex-cool coolant had caused damage. Still over heated. Same mechanic said it was the...


If the water pump and thermostat have been replaced and the system has been properly refilled and bled , the only thing left is the radiator. If coolant is not flowing through it properly , vehicle will run hot. If your car has overheated to the point of boiling over , your new thermostat may now be damaged again.. As for the fans , they only come on when the coolant reaches a certain temprature. Under normal driving conditions , they would not need to come on while the vehicle is moving , as the air flow from driving down the road would be enough to cool the engine.

Feb 03, 2011 | 2002 Pontiac Aztek

1 Answer

I changed the water pump and the thermostat.changed the intake gasket and temperature sensor.but still overheating and coming out the overflow.


it could be the head gasket blown out...there is a test for this,, i call it a "sniffer test"??? what happens is you **** out some rad water and tip in a chemical that picks up any hydrocarbons in the water,,,and if the cylinder head gasket is leaking there will be hydrocardons in this water if none are found its not the gasket,,,so check the rad is clear and not blocked and you dont have an air lock in the water jaket

Jun 27, 2010 | 2001 Chevrolet Malibu

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Have an intermittent overheating problem with my 2003 Pontiac Aztek. I have replaced the intake manifold gasket three months ago. Along with that I changed the thermostat. I notice no leaking. I have also...


I had a similar problem with an Olds Intrigue. It turned out to be the aftermarket ( NAPA ) thermostat. I bought a thermostat from GM the problem went away. I typed my problem into google and found where GM had sent out a service bulletin on the problem and had come up with an "enhanced designed thermostat". I hope this helps, good luck.

Mar 27, 2010 | 2003 Pontiac Aztek

1 Answer

Recently had intake gasket replaced and coolant keeps overflowing out of resivoir and car overheats . someone told me that it might be the cap on the resivoir?


If you haven't changed the thermostat that would be my first step. A stuck thermostat could definitely cause oerheating.
Look inside your oil filler cap and on the oil dipstick. See if there is a creamy light colored residue. Those could be symptoms.
By intake gasket do you mean intake manifold gasket? The gasket that could cause overheating would be the head gasket. A head gasket leak can usually be detected with a compression test - you may be able to rent a compression tester from a parts house. A cracked head could cause similar symptoms. A defective or even missing cap would not likely cause the problem you describe.

Dec 19, 2009 | 2003 Pontiac Grand Am

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Malibu is overheating and i cant keep adding anti-freeze daily!!!


No heat is probably a result of low coolant, which basically starves heater core when necessary to feed rest of engine when coolant too low, or an airlock. I really think it's time you took it to a rad shop or similar & had a pressure test done on system & a proper diagnosis. Delaying it will only cost you more, like a whole new engine.

Aug 25, 2009 | 2002 Chevrolet Malibu

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