Question about Chevrolet Malibu

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Slightly overheating while at idle and heater on low or off.

So far I have not had a single problem with my car but lately my temperature gauge will rise above average. The current temperature outside is -3. When my temperature rises and I turn on the heater, the temperature stays the same and will slowly start to drop to the half way mark and stay there but when I turn the heat below number 2 setting, it will begin to rise again. This only happens when I am idling and I am not leaking any fluids at all. This car is 100% all original with no cooling system parts replaced.

1997 Pontiac Grand Am se 2 door
143,000 km on motor
2.4L twin cam
Automatic Transmission

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  • Bradley Hynes Apr 18, 2009

    I picked one up and was going to change it tomorrow but just wanted to see if there could be any other causes for the problem. Thanks

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  • Master
  • 295 Answers

The thermostat is starting to stick .
Replace the thermostat.

Posted on Apr 18, 2009

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Posted on Jan 02, 2017

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SOURCE: my coolant tempature keeps on rising while in idle.

try chnging the temperature sensor for tha fan

Posted on Aug 25, 2009

emissionwiz
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SOURCE: when i crank my car

The most common cause of this is leaking air suspension bags (also called air springs).

Posted on Apr 12, 2011

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Changed out water pump and thermostat and vehicle runs high temperature what could be issue?


Reasons the Temperature Gauge Reads High

If the temperature gauge reads high, it could mean your engine is overheating. Another reason your reading might be high is you could be losing coolant. A small leak or evaporation may cause your radiator to slowly lose coolant. A third reason your temperature gauge reads high could be because the thermostat is broken. If this is the case, you may need a coolant temperature switch replacement. The last reason the temperature gauge could read high is because of a water pump, or water pump gasket failure. If the water pump is malfunctioning, it may need to be replaced by a professional.

What to Do If Your Temperature Gauge is High

If your temperature gauge is reading high, it means your car is overheating. This is a very serious matter and you should never drive an overheating car. If your car starts to overheat, shut off the air conditioner and open the windows immediately. If this does not reduce the overheating, turn on the heater as high as it can go. If this still doesn't work, pull over on the side of the road, turn off the engine, open the hood carefully, and wait until the vehicle cools down. Never open the radiator cap while the engine is hot - coolant can spray and burn you. Once the vehicle has cooled, take the car to a mechanic right away so they can diagnose the problem. Cars are especially susceptible to overheating in hot climates, like what's common in cities like Los Angeles, Phoenix, Las Vegas, or Atlanta.
The temperature gauge is an important tool in your vehicle that shows the temperature of your engine's coolant. Contact YourMechanic and have your car inspected for overheating if it reads too high, as this can cause serious problems...

Reasons the Temperature Gauge Reads Cold

On most vehicles, the temperature gauge reads cold until the engine has run for a few minutes. If the temperature gauge still reads cold after the engine has warmed up, the gauge may simply be broken. Another reason the temperature gauge could read cold is if the thermostat in the vehicle stays open. With the thermostat stuck open, the engine can be overcooled, causing a low temperature reading. If this is the case, the thermostat may need to be replaced.

Oct 28, 2017 | Cars & Trucks

2 Answers

I have 2006 Chevy impala 3.5l and it's slightly overheating and I just recently changed the water pump and thermostat but it didn't change, and when I turn my heater on the air flow is very low.


check the lower (suction) radiator hose that it cannot collapse, they usually have a metal coil inside to prevent this. If you left this out when installing the water pump it could be the cause..What temperature is the gauge reading? You could have been running too cool before and now that the new thermostat is in its up to normal temperature.

Low airflow through the heater is a separate issue and can be caused by leaves in the ductwork, a blend door not opening/closing fully, clogged heater core (are you a smoker?) Good luck.

Edit: I had another thought on this.. the cooling system needs bled carefully, air in the system can cause symptoms like you describe, look for a bleeder screw on top of the engine somewhere and make sure to let the air out of the system.

Jun 27, 2015 | Cars & Trucks

1 Answer

Overheating/no heat


My first guess is the cooling system is low on liquid coolant. That would cause both symptoms. The radiator can be low even if the overflow tank is full. The cooling system can have air pockets.

Jan 24, 2014 | 2001 Chevrolet Malibu

1 Answer

2001 Oldsmobile Silhouette...Overheating, changed the thermostat, no signs of leaking, and the oil looks fine. At idle it takes 20 minutes to max the temperature gauge (red) and while driving it take


Usually the problem with no heat and overheating is low coolant, thermostat, or a faulty water pump impeller.
The radiator may not be full of liquid coolant, or the pump may not be moving the coolant thru the block.

Feb 19, 2013 | 2001 Oldsmobile Silhouette

1 Answer

1994 Intrepid 3.3 Overheating - radiator replaced , thermostat replaced, water pump replaced, bled the cooling system 10 times...still overheating. What could the problem possibly be? Any suggestions?


Did you have the heater on while bleeding? Leave cap off, heater on and let it idle up to temperature, and occasionally rev slightly for a few seconds to help flow. Add as needed when coolant gets low during.

Feb 10, 2013 | Cars & Trucks

2 Answers

1990 dodge dakota 2.5 over heats temp gauge erratic


For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----

temp gauge goes erratic? http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

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Temperature gauge keeps fluctuating up and down close to red? http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html

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Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
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Temperature gauge does not move and no heat when heater is ON? http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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This details will help.Thanks.

Feb 07, 2012 | 1990 Dodge Dakota

2 Answers

Over heating


When your temperature gauge reaches "H' it may too late to prevent a major breakdown. Knowing the symptoms of an overheated car and how they occur may be the difference between being inconvenienced and incapacitated.
Identification:---Other than a low oil level or low oil pressure light, there is not a more significant part of a car's instrumentation than a rising temperature gauge or a glowing "Hot" light. These lights are really the only confirmation a driver has that his car is really overheating. It is the identification of the symptoms of an overheating car that enable the motorist to avert a badly damaged engine. Overheating is always a traumatic event for a car's engine, which makes the early identification of the symptom an important addition to the informed motorist's tool kit.
Stuck Thermostat:--The car's thermostat is a valve that controls coolant flow from the engine block to the radiator. When the engine is cold the thermostat remains closed so that the coolant can reach operating temperature quicker and also provide heat to the passenger's compartment. The thermostat has a spring on it that moves depending on coolant temperature causing the thermostat to open. Sometimes the thermostat fails to open thus restricting coolant flow to the radiator where it would be cooled down. This condition is often the cause of overheating. The symptoms of this cause would be a rising temperature gauge and possibly the loss of heat inside the car.
Restricted Radiator:---A car's radiator will have thousands of gallons of coolant passing through in its lifetime. Along with the coolant comes particulate matter in the form of corrosion breaking loose from various parts of the car's cooling system. These contaminates collect in the tubes of the radiator reducing its efficiency. Extensive "plugging" in the radiator will cause the car to overheat. The symptom of this condition would be a rising temperature gauge which goes up when you accelerate.
Coolant Loss:--A car's cooling system is a closed loop system. You are not supposed to lose coolant. Sufficient coolant loss will cause the engine to run hot because engine is heating less coolant to higher temperatures. The symptom of overheating induced by coolant loss would be a pool of coolant on the pavement when the leak is external. Steam under the hood as the lost coolant hits hot parts of the engine, or a rising temperature gauge in the case of a undetectable engine related leak. Of course, the gauge would also go up if the leaks were not detected. Deteriorated Water Pump:--Cars use a belt driven pump to push the water and coolant mixture through the cooling system. This part is called the water pump. Rarely the impeller that draws the coolant through the pump will rust away making it impossible to push any through the system. If this occurs the temperature gauge will climb and coolant will boil over in the radiator. Inoperable Fan:----Most cooling fans are electrically driven. Some are driven by fan belts. If a belt breaks or the electric supply to the fan is interrupted overheating may result. Electric fans are tuned on thermostatically when needed. When the car runs at idle for extended periods or the weather is extremely hot, a failed fan will cause overheating otherwise it serves as a standby assist to the rest of the cooling system. In stress conditions an inoperable fan will cause the temperature gauge to rise. This will help. Thanks please keep updated.please please do rate the solution positively .thank you for using fixya

Mar 19, 2010 | 2001 Hyundai Accent

1 Answer

Temperature gauge is inaccurate and check engine light comes on but its not over heating and everything else is fine can it be a sensor ? The temperatue gauage didn't read anything for months but now...


Have you checked the antifreeze level lately? Low antifreeze will cause a temp sensor to give false readings. Does your heater work OK, as in does it blow hot air when heater is on? that is another symptom of low antifreeze.

As far as the check engine light coming off and on, I would bet it is the oxygen sensor that might need to be replaced.

Oct 20, 2009 | 1985 Chevrolet Monte Carlo

1 Answer

'90 Subaru Legacy overheating....


cool air and overheating point to low coolant level. Do you have a bleeder valve near the thermostat? You may have air trapped in the system. If no air trapped, the radiator may be plugged up not allowing proper circulation of coolant.

Mar 24, 2009 | 1997 Subaru Legacy

1 Answer

My 1996 ford windstar temperature gauge shows overheating


Your heater core more than likely needs to be replaced unfortunately. If the engine is heating properly and there are no freeze plugs that have been popped then that is your most likely problem.

Jan 07, 2009 | 1996 Ford Windstar

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