Question about 1999 Chevrolet Malibu

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Engine overheating my 1999 chevy malibu keeps overheating. i changed the radiator,thermastat,water pump and the fan sensor and its still overheating what can i do to fix this problem

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The same thing happened with my 01 cavalier. My dad replaced the thermostat and it did the same thing. Then he discovered that there is something called a temperature control sensor that had to be replaced because when the thermostat froze open, it destroyed the sensor. It was a lot cheaper than any of the other parts and once it was replaced, it worked fine.

Posted on Jun 01, 2009

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Sometime a car will overheat it there is air int he system. You can buy a resivor that will screw tot he top of your radiator that is made for burping the system. This can be found at your local auto parts store.

Posted on May 16, 2009

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1 Answer

Changed water pump and thermastat but still running hot 01 chevy malibu


Pluged radiator , cooling fans not coming on , radiator cap bad , coolant passages clogged , Have you have system flushed ? What is the condition of coolant ? Does it have original dexcool antifreeze ?

Oct 31, 2016 | Cars & Trucks

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Thermastat and water pump changed but still overheating. why?


Could be a few things. Blockage in the radiator, blown headgasket, bad fan. Need to check for those or get a shop to have a look.

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I have a 1999 Pontiac Grand Am GT that keeps Overheating. I've changed the Water pump, Radiator, Rehotwired the fans to alway come on right when I start the car and only go off when I kill it. It


With a over heating problem the first place you always check is the thermastat.Thermastats ALWAYS go.
In fact every two years I change the thermastat wether or not it needs it just to be safe than sorry,I live in a snow belt and nothing worst than having no heat in the winter.
Something else you might keep in mind, over heating can do allot of damage most people don't consider, the transmission lines are connected to the radiator which cool the transmission

Feb 19, 2013 | 1999 Pontiac Grand Am GT

1 Answer

My 1999 Chevy Malibu is losing the coolant though the overflow hose by the resevior I've had my head gaskets replaced there is no overheating no water oil mix, but my radiator fans arent working I


Sounds like you need to disconnect the Radiators' electric fans and have them tested. You absolutely must have them working, or your car will overheat. Check to see if the Temperature guage is working.

You need to go to a good autoparts store and have them test the fans and charge and test your battery. You may need some sensors to activate the Radiator fans, but you could be running the battery down with shorted cooling fans.

There are also Relays which work with the Radiator fans. The overflow will stabilize once the water gets into where it belongs. Make sure your Thermostat is not clogged with the sealer.

Jan 15, 2012 | 1998 Chevrolet Malibu

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I have a 1999 chevy malibu , front wheel drive with a 2.4 litre twin cam engine . the car overheats and water pours out of overflow hose. what is the cause of this?


well, a lot potentially COULD be wrong. here is my list of what to check.

hoses for deterioration and sponginess, its unlikely but possible your hoses are collapsing due to poor condition and not letting water flow through it

check thermostat for proper operation ( remove thermostat, compress spring to open it insert string then suspend it in a pan of boiling water. it will fall off the spring at the aprox. temp its set at. if it is stuck closed then its your culprit)

check water pump ( hard to diagnose, some cars have a weep hole at the bottom of the water pump that drips water while running at any temp. )

check antifreeze dilution and condition, water cools better that anti-freeze 50-50 is recommended but in hotter climates 25-75 is more appropriate. also the dirtier it is the worse it cools

ensure your engine fan is operating by running the car and observing it with the hood open. at a specified temp ( 200-230 F neighborhood) it should turn on. If it doesn't then check your fuses and wiring and repair/replace as needed

finally check for a clogged radiator/ flush it. If the car was bought used or you know for a fact the radiator stop-leak pellets were used in it. you will most likely have to replace the radiator

other factors are engine timing (shouldn't be an issue for your year of car)

I hope this helps a bit

Sep 04, 2011 | 1999 Chevrolet Malibu

1 Answer

Overheating


OVERHEATING CAN BE CAUSE BY MANY THINGS LIKE FAULTY THERMOSTAT AND FAULTY RADIATOR PRESSURE CAP,TOO MUCH WATER IN COOLANT SYSTEM NEED 50 / 50 WATER AND ANTIFREEZE.LOOK FOR WATER PUMP WEEP HOLE LEAK, IF COOLANT LEAKING OUT WEEP HOLE WATER PUMP BAD NEED REPLACING.CHECK FOR LOW COOLANT LEVEL, YOUR RADIATOR OVERFLOW JUG SHOULD HAVE COOLANT AT THE FULL COLD MARK IF NOT KEEP ADDING COOLANT INTO COOLANT OVERFLOW JUG UNTIL COOLANT STOP DROPPING AND FULL COLD MARK, IF OVERFLOW COOLANT JUG WAS EMPTY RADIATOR IS LOW ON COOLANT.WHICH CAUSE AIR IN COOLANT SYSTEM KEEPING THE ENGINE COOLANT TEMPERATURE SENSOR FROM BEING SUBMERGE IN HOT COOLANT WHICH TURN ON THE COOLANT FANS.WHEN ENGINE COOLANT TEMPERATURE GET CERTAIN SET TEMPERATURE LIKE 190 DEGREES THE PCM AND COOLANT SENSOR WILL TURN ON COOLANT FANS, IF VECHICLE OVERHEATING COOLANT FANS NOT WORKING EITHER YOU HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR CHECK COOLANT FANS FUSE AND RELAYS. YOU CAN CODE SCAN CAR TO SEE IF YOU HAVE FAULTY PCM, FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FAN RELAY.IF COOLANT FAN AND ENGINE COOLANT TEMPERATURE SENSOR OKAY,YOU HAVE CORRECT COOLANT LEVEL IN COOLANT SYSTEM, THERMOSTAT AND RADIATOR PRESSURE CAP BEEN REPLACED, YOU COULD HAVE BLOWN HEAD GASKET CHECK ENGINE OIL LOOKS LIKE MILK SHAKE HEAD GASKET BLOWED ALSO WHEN HEAD GASKET BLOWED YOU CAN DRIVE CAR SHORT DISTANCE START OVERHEATING AND YOU LOOSE ENGINE POWER SUSPECT BLOWED HEAD GASKET.

Aug 04, 2011 | 1999 Oldsmobile Alero

1 Answer

My 98 chevy malibu is running a little hot. the heads are not cracked.changed the anti freeze.change the thermostate. what could be the problem


If your engine is running fine with no miss in it possibilities could be radiator fan or water pump if the radiator fan is working fine it could be the water pump. I have seen a water pump after removing it where the fins on the pump were completely worn out causing the overheating.Let me know how this turns out for you thanks.

Jul 27, 2011 | Chevrolet Malibu Cars & Trucks

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My 2005 pontiac grand prix was overheating and was leaking water out of the jug so I put a thermastat in it . And it still was overheating so I flushed the radiator and it was still overheating,then I...


Most likely it is a combination problem involving the water pump. The temp sensor being slow to respond being the problem would be easily identified. If the vehicle is over heating when you are moving and 30 to 40 mph it is not a sensor or Fan. It could possibly still be the fan if the fan clutches are not working and allowing it to free spin as air moves faster through the Radiator but this is less likely than a bad water pump.

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2 Answers

Why am i overheating


Most likely have a bad intake gasket, or clogged radiator. make sure your fans are coming on also.

Jul 23, 2009 | 1999 Chevrolet Malibu

1 Answer

1999 chevy malibu engine keeps over heating, possibly a blown head gasket?


Overheating could be a combo of many thing's.If your thermostat is stuck you will have no circulation which will cause overheating.Also if your eng. has alot of miles your water pump may be in need of replacement.Listen for your radiator fan motor and be sure that's working and also check to see if you radiator is good.If your loosing antifreeze because of a headgasket you will see a white cloud out of the exhuast because it is burning it and sometimes you also get a little in your eng.oil.Using a pressure tester on your coolant system will help to diognos the problem,if you have a leak some where it will not hold pressure.Sign,s of a bad waterpump are poor circulation and a antifreeze leak from a vent on the waterpump.Be sure the eng. is cool before working on it.Hope this was helpfull.

Mar 01, 2009 | 1999 Chevrolet Malibu

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