Hi ben, I’m jon. I have an 02 Impala that’s been having a few issues. Low coolant light came on I checked and it was very low, lon

I have an 02 Impala that's been having a few issues. Low coolant light came on I checked and it was very low, long story short, I replaced the water pump, thermostat, serpentine belt plugs and wires. Still gets hot, any thoughts, I was thinking the lim gasket. .?

My car has 270000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
I would first use a scan tool and directly measure the coolant temperature and, at the same time, test the sending unit to be sure that the car is actually overheating versus, say, a circumstance where there is a problem with the gauge or sending unit. With a scan tool, you should see an engine temperature of around 200 degrees F. As long as you don’t see a reading above 215 degrees you are normal. If the car is overheating, apart from the items you already serviced, the other common causes of overheating include trapped air, a plugged radiator, a faulty radiator pressure cap, collapsed hoses, non functioning cooling fans, and a loose water pump drive belt. Certain engine faults, such as a leaking head gasket or poor engine running condition can also cause overheating. If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine overheating diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a Chevrolet Impala is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat. Coolant leak (water pump, radiator, hose etc.)
6 Answers. Should be located next to the thermostat housing.
Reasons a Chevrolet Impala Heater Isn`t Working. The most common reasons a Chevrolet Impala heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. Search our network of RepairPal Certified shops near you to speak with a technician about your issue …
You have 3 O2 sensors on your V6 Impala. One front O2 sensor (sensor 1) for each bank of the V.
Alongside the signal that your engine is overheating, you may see your check engine light come on if your coolant temperature sensor is failing or has failed. If your car`s computer senses a problem with the signal your sensor is sending, it may trigger the check engine light.
Only Use Water In The Radiator In An Emergency

If it`s really low or actually empty, you need to add fluid to your vehicle. While it`s ideal to add a 50/50 mix of coolant and water (or a pre-mixed coolant), if you absolutely have to keep driving, you can add water to the radiator to get you to your destination.

Can you top your coolant up with water? Coolant should only be topped up with water in case of an emergency when the coolant liquid level is lower than it should be. While topping up with water will help you get safely to the nearest RAC Approved Garage and identify any issues, it shouldn`t be relied upon.
The most common reasons a Chevrolet Impala Limited is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat. Coolant leak (water pump, radiator, hose etc.)
A frayed wire or a blown fuse can prevent an otherwise healthy A/C from functioning. Diagnosing and correcting an electrical problem begins with performing a complete visual inspection of your car`s fuse box and wiring. If any of these issues are causing your car to blow hot air, drive to your local Tires Plus.
If you notice that your engine overheats, the coolant temperature sensor could be the problem. At times, the coolant temperature switch may fail such that it starts transmitting hot signals permanently. This causes the computer to erroneously counterbalance the signal, thereby causing the engine to misfire or overheat.
An overheating engine won`t resolve on its own, even if it seems to be fixed after you add a little coolant. It will only get worse if left unaddressed.
Also known as the O2 sensor because O2 is the chemical formula for oxygen, the oxygen sensor monitors how much unburned oxygen is present in the exhaust as exhaust exits the engine. By monitoring oxygen levels, the sensor provides a means of measuring fuel mixture.
The oxygen sensor is a part of your emission control system and it monitors the air to fuel ratio, sending data to the engine management computer.
A failing oxygen sensor is an oft-overlooked cause of overheating. Your converter links to oxygen sensors in your vehicle. These sensors are used to measure the mix of air and liquid fuel. If the mix is off and becomes too rich, your catalytic converter can overheat as a result.
The Thermocouple As A Temperature Sensor. The Thermocouple is by far the most commonly used type of all the temperature sensor types. Thermocouples are popular due to its simplicity, ease of use and their speed of response to changes in temperature, due mainly to their small size.
There are two temperature sensors in some vehicles, one to send information from the engine system to the control unit and another from the control unit to the dashboard. The device follows the principle of dependence of potential difference in temperature.
Most of the time, excess coolant is expelled from an overflow hose. You`ll likely see a puddle of coolant beneath your car if this has happened. In worst case scenarios, overfilling your antifreeze tank can lead to electrical damage if overflow comes into contact with engine wiring.
Without water, the additives will settle to the bottom of the cooling system. When this happens, the additives won`t run through the cooling system as effectively and some parts may corrode as a result.
One way to check for proper coolant circulation is to check the upper and lower radiator hoses. The upper radiator hose should be hot, around 190–200 °F. (The safest and most accurate way to get this temperature reading is with an infrared thermometer.)
Start your car`s engine and allow it to idle. Look through the radiator filler neck to see if the coolant flows. At this time, it should not be flowing as your car has not reached the operating temperature to cause the thermostat to open. If you find the coolant is flowing, it means the thermostat valve is open.
With the engine off, open your hood and locate the water pump pulley. With gloves on, grab it and wiggle it back and forth. There should be no movement, if there is, this along with the noise is a good indication you may have a water pump problem.
Where do I put water when my car overheats? You need to put the water in the radiator by removing the pressure cap once your vehicle cools down. You can also add the water to the coolant reservoir or recovery tank if your car is overheating to the point where there`s steam.
The most common reasons a Chevrolet Impala is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat.
Leaks are the #1 reason a vehicle begins to overheat. Leaks in hoses, the radiator, water pump, thermostat housing, heater core, head gasket, freeze plugs and a few other things can all lead to problems with the vehicle`s cooling system.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Hi ben, I’m jon. I have an 02 Impala that’s been having a few issues. Low coolant light came on I checked and it was very low, lon
ANSWER : I would first use a scan tool and directly measure the coolant temperature and, at the same time, test the sending unit to be sure that the car is actually overheating versus, say, a circumstance where there is a problem with the gauge or sending unit. With a scan tool, you should see an engine temperature of around 200 degrees F. As long as you don’t see a reading above 215 degrees you are normal. If the car is overheating, apart from the items you already serviced, the other common causes of overheating include trapped air, a plugged radiator, a faulty radiator pressure cap, collapsed hoses, non functioning cooling fans, and a loose water pump drive belt. Certain engine faults, such as a leaking head gasket or poor engine running condition can also cause overheating. If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine overheating diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

my check engine light came on a few weeks ago and said it was coolant issue light went out and a few days ago it came back on
ANSWER : Your vehicle has less than 60,000 miles and inasmuch as you mention a possible fault in the engine cooling system, you should check for warranty coverage under Chrysler’s 5 year/60,000 miles powertrain warranty. If you are not covered under the manufacturer warranty, I recommend you request an overheating diagnostic from YourMechanic simply because a car that is overheating is essentially inoperable. You will ruin the engine if it gets hot enough, by warping essential engine components, so overheating has to be resolved before the issue with the electronic throttle is addressed. In your case, inasmuch as the Check Engine Light (CEL) has come on as well, the Mechanic will download the diagnostic trouble codes that always set when the CEL illumuninates and use those trouble codes as clues to resolving the issue you are having.

No coolant in the reservoir. Seen low coolant message. I added 2 quarts of 50/50 coolant. Still getting the message. How much coolant doe it need?
ANSWER : Hi there. For the coolant light to go out, you would need to have the coolant between the low line and the full line for the light to go out. If the coolant is low and keeps on being low, then look for any signs of coolant leaks. You may have to use a coolant pressure tester to pressurize the reservoir to allow the leak to be found.

If you need further assistance with the coolant being low and the warning light being on, then seek out a professional, such as one from Your Mechanic, to help you.

Low coolant level light on, low oil light on
ANSWER : Hello. Several owners of the BMW 750i have complained of this issue. The usual fix required is a PCM reflash. The PCM flash will have to be done by BMW but it is the most likely cause and most common fix for this issue. If you would like to have this verified, you may consider having a certified technician, like one from YourMechanic, come to your car’s location to diagnose the coolant and oil light to see if there is a different problem.

Low oil pressure light comes on when idle. Check engine light is on as well. Both came on after getting an oil change 3 days ago.
ANSWER : It is possible that they put in the wrong viscosity oil. In rare instances, a defective filter will also cause low pressure. If there is too much oil, it will aerate and cause low pressure. Be sure the oil level is really not above "max". The P2187 code will appear if the oil fill cap is not tight but it will also appear due to a myriad of causes because that code only "generally" identifies a lean running condition. Consequently, numerous parts would have to be tested including the O2 sensor, gas cap seal, manifold air leaks, any vacuum leak anywhere including PCV and EVAP systems, exhaust leaks, and fuel system faults such as failing fuel pump, clogged filter and more. Since the car has relatively low mileage, you would not expect a failed oil pump, although the pressure sensor (or switch) could be bad. However, the occurrence of the oil pressure warning light is quite coincidental to the oil change, thus I would suggest bringing the car back and asking them to redo with a new filter and double check the viscosity of the new oil that they use. If the problem persists after that, you will have to test actual operating oil pressure (at idle for instance) as well as the oil pressure switch. Finally, if the oil pressure warning light comes on continuously, unless the warning circuit itself is malfunctioning, that means the oil pressure is too low to operate the engine without damaging it. Anytime the light comes on for more than literally an instant, you should shut down the car and thus an issue like this obviously has to be repaired.

If you’d like, a YourMechanic certified mechanic can come to your home or place of business to inspect the vehicle and perform an oil pressure light is on inspection to diagnose the vehicle and suggest potential repairs.

Car started to slow down and then the check engine light, battery, and engine oil light came on. What could cause this?
ANSWER : Hi there. It is possible that the battery cable came loose or the wires to the oil pressure sensor has came loose or failed. Check the battery cables and make sure that the terminals are tight and clean. Check the wires to the oil pressure sensor and make sure that they are connected and not broken. If everything looks good, then the oil pressure sensor may have failed. Plus, check the computer for codes and see what is stored. This will lead you to the part that could have failed. I recommend replacing the oil pressure sensor then checking to see if the lights will go out. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from Your Mechanic, that can assist you with the warning lights that came on.

Low coolant light comes on when AC, defrost or heater is on, but only if the car is in gear and stopped, what’s wrong with my car?
ANSWER : First, you want to make sure your cooling system is full. Check the radiator not the coolant jug. And check it when it is cold. If it needs coolant, add some. Of course, I don’t feel this problem is an actual low coolant condition. I would expect to find an electrical failure in the instrument cluster or from a component or wiring harness that is connected to the instrument cluster.

As a technician, I have access to reports from technicians across the country. I could not find any reports of this problem, so diagnosing this will require an experienced tech as this is not a common problem. In addition, this happens at intermittent times making it difficult to recreate. The most challenging part of this diagnosis will be recreating the symptom. I suspect it has something to do with the brake switch circuitry because it only seems to happen when you have your foot on the brake. I would begin my diagnosis there with a wiring diagram and test light in hand. The brake switch, instrument cluster, and environmental controls all interact with each other. Something is crossed either because of a failed module or damaged wiring in a harness.

Aside from making sure the coolant is full, this will not likely leave you on the side of the road. If you take it in to be diagnosed, be prepared for them to spend more time than usual to figure it out. Since it isn’t a key problem, you may need to live with it until it completely fails making it much easier to diagnose. Either way, I do recommend having a certified mechanic diagnose the warning light to make sure there isn’t anything serious going on.

Good luck.

While driving on freeway truck goes into a limp mode, and the check engine light, abs light, parking break light, service brake
ANSWER : It is possible that you could be having an issue with your powertrain control module. This is somewhat of a common problem on many GM vehicles. I would recommend having your vehicle inspected by the dealership to determine if the powertrain control module is functioning properly. If not, a reflash of the powertrain control module may resolve the issue but often times it must be replaced.