Have you noticed your car overheating, and now it won’t start? You’re not alone. Overheating can cause a host of problems for your vehicle, and it’s essential to address the issue as soon as possible.
In this article, we’ll explore the common causes of car overheating and not starting and what you can do to fix the problem.
We’ll help you understand the warning signs from engine damage to transmission issues and get your car back on the road.
Are you ready for this great discovery? Read on!
Table of contents
What Does it Mean if Car Overheats and won’t Start but Turns Over?
If a car overheats and won’t start but turns over, it means that the starter motor is working and the battery has enough power to turn the engine over, but the engine is not running.
This could be caused by several issues, such as a damaged engine resulting from overheating, a lack of compression in the engine, a problem with the ignition system, or a problem with the fuel system.
However, it is advisable to have a mechanic diagnose the issue as soon as possible to determine the cause and make the necessary repairs.
Is it Safe to Drive a Car after Overheating?
It is not safe to drive a car after it has overheated. Overheating can cause severe damage to the engine and other components, and driving the vehicle can worsen the damage.
Also, if the car has been overheating, the driver may not know the exact cause, and it could be dangerous to continue driving.
When a car overheats, it is essential to pull over and turn off the engine as soon as possible.
Reasons Why Car Overheats, Won’t Start, But Turns Over
1. Low Engine Oil
The engine oil is responsible for lubricating the moving parts of the engine, and it also helps to dissipate heat.
Low oil can cause the engine to overheat as the moving parts are not properly lubricated, leading to friction and heat build-up. Low oil levels can also cause the engine to seize, preventing the car from starting.
To fix: The solution is to add more oil to the engine. To do this, locate the oil dipstick, pull it out and check the oil level. If the oil level is low, add more oil to the engine. Please use the type of oil recommended by the manufacturer of the car.
2. A Bad Head Gasket
The head gasket is a seal between the cylinder head and the engine block, which helps keep the compression and coolant inside the engine.
If the head gasket is damaged or worn, it can cause coolant to leak into the engine oil or combustion chamber. This can cause the engine to overheat as the coolant cannot circulate properly and can also lead to a loss of compression, causing the engine not to start.
A damaged head gasket can also cause the engine to misfire or decrease the power and can also cause white smoke to come out of the exhaust.
To fix: A bad head gasket is a serious issue and requires a professional mechanic to repair it.
3. Valve Cover Gasket
A damaged or worn valve cover gasket can also cause the car to overheat and not start. The valve cover gasket is a seal between the valve cover and the engine block, and it helps keep the engine oil inside the engine.
If the valve cover gasket is damaged or worn, it can cause oil to leak out of the engine.
To fix a valve cover gasket, you will need to follow these steps:
- Locate the valve cover on your engine and remove any components blocking access.
- Using a socket wrench, remove the bolts that hold the valve cover in place.
- Carefully remove the valve cover and set it aside.
- Inspect the gasket for signs of wear or damage. If the gasket is damaged, you will need to replace it.
- Clean the surface of the engine where the gasket will be placed, making sure to remove any old gasket material or debris.
- Place the new gasket on the engine, ensuring it is appropriately aligned.
- Carefully place the valve cover back on the engine, ensuring the gasket is seated correctly.
- Replace the bolts that hold the valve cover in place, making sure they are tightened to the appropriate torque specification.
- Start the engine and check for any leaks around the valve cover.
- If everything looks good, you can return the removed components, and you are done.
4. Weak Battery
A weak battery can also impact the car’s electrical system and cause the alternator to work harder, which can cause the engine to overheat.
A parasitic drain can also cause a weak battery, for example, a door light left on overnight, a trunk light that stays on, or an audio system that doesn’t turn off when the car is off. This will drain the battery and cause it to not start the engine.
To fix:
- Make sure the terminals are clean and tightly connected. If the terminals are corroded, clean them with a wire brush and baking soda.
- Use a voltmeter to check the voltage of the battery. A fully charged battery should have a voltage of 12.6 volts or higher. If the voltage is lower, the battery may be weak or failing.
- Use a hydrometer to check the state of charge of the battery. The battery’s electrolyte level should be between the upper and lower-level indicators.
- Check the alternator
- Check for parasitic drains.
- If the above steps do not resolve the issue, and you believe the battery is weak or failing, you may need to replace it.
5. Damaged Thermostat
The thermostat is a device located in the engine that regulates the flow of coolant through the engine. It helps to keep the engine at a consistent operating temperature.
If the thermostat is damaged or stuck in the closed position, it can prevent coolant from flowing through the engine properly, causing it to overheat.
In extension, a damaged thermostat can also cause the engine to not start, as it may not allow it to reach the proper operating temperature.
To fix: Drain the coolant from the engine, remove the thermostat housing, and install the new thermostat. Make sure to follow the instructions provided by the manufacturer and refer to your vehicle’s repair manual for specific instructions.
6. Faulty Sensors
The car’s engine control module (ECM) relies on input from various sensors to control the engine’s performance. If one or more of these sensors are faulty, it can cause the engine to run poorly and overheat.
For example, a faulty coolant temperature sensor can cause the engine to run too hot, and a faulty crankshaft position sensor can prevent the engine from starting.
To fix:
- Locate the sensor
- Test the sensor using a multimeter or other diagnostic tool to see if it works properly.
- Replace the sensor; however, use the correct type of sensor for your vehicle and install it properly.
- Once the sensor is replaced, clear the codes from the vehicle’s computer, and test drive the vehicle to ensure the problem has been resolved.
Symptoms of an Overheated Car
Cars can give signs before getting overheated, but they may not always be obvious or easy to recognize. Some common signs that a car may be at risk of overheating include:
1. Temperature Gauge Reading Goes High
The temperature gauge on your dashboard is the most straightforward indicator of an overheating engine. It is important to keep an eye on the gauge, and if it starts to move toward the red zone, it’s a sign that your engine is too hot and needs to cool down.
If the gauge is in the red zone or higher, it indicates that the engine is in danger of severe damage. It’s important to stop the car as soon as possible and turn off the engine.
2. Steam or Coke Coming from Under the Hood
Steam or smoke coming from under the hood is a clear sign that the engine is overheating. Various issues, such as a leak in the coolant system, a clogged radiator, or a damaged head gasket, can cause this.
The coolant system is designed to keep the engine at a consistent temperature, and if there is a leak or a clog, the coolant can’t circulate properly, resulting in overheating.
3. Warning Lights or Messages on the Dashboard
Many modern cars have warning lights or messages on the dashboard when the engine is overheating. These lights may include the check engine light, the temperature warning light, or a message that says “engine hot.”
These warning lights are designed to alert the driver to potential issues, so it’s important to pay attention to them and take action as soon as possible.
4. Strange Noises from the Engine
Overheating can cause strange noises from the engine, such as knocking or ticking sounds. These noises can signal damage to the engine or other parts of the car.
In some cases, the noise may indicate a problem with the water pump, responsible for circulating coolant through the engine.
5. Reduced Performance
Overheating can lead to engine power loss, causing the car to lose speed or stall. This can happen when the engine is not getting enough coolant, causing the temperature to rise and the engine to lose power.
6. Burning Smell
You can start perceiving some burning odor from your car. Several things, such as a leak in the coolant system, a clogged radiator, or a damaged head gasket, could cause this.
In addition, a burning smell can also indicate that there is a problem with the oil or transmission fluid in the car.
How to Troubleshoot the Problem
The symptoms of each car differ; however, if your car is getting overheated and won’t start, you can troubleshoot it by trying out these steps:
1. Check the Coolant Level
- Locate the coolant reservoir, which is typically a transparent plastic container near the radiator.
- Check the coolant’s level and ensure it is between the minimum and maximum marks. If the coolant level is low, it could indicate a leak in the coolant system.
2. Inspect the Radiator and Hoses
Look for any signs of leaks or cracks in the radiator or hoses, which could be causing the coolant to leak out. Ensure that the hoses are connected properly and that there are no kinks or blockages.
3. Check the Oil Level
To check the oil level, locate the dipstick, which is usually a long, thin stick with a handle, pull it out, and check the oil level.
The oil should be between the minimum and maximum marks on the dipstick. If the oil level is low, add more oil to the engine.
4. Pay Attention to Strange Noises
Overheating can cause strange noises from the engine, such as knocking or ticking sounds. These noises can signal damage to the engine or other parts of the car.
While the engine is running, listen for any unusual sounds and note where the noise is coming from.
How to Prevent a Car from Overheating
1. Regular Maintenance
One of the best ways to prevent a car from overheating and not starting is to schedule regular maintenance with a professional mechanic. A regular maintenance schedule can help to detect and prevent potential issues before they cause serious problems.
2. Proper Use of the Vehicle
Proper use of the vehicle can also help to prevent car overheating. This includes not overloading the vehicle, not towing too much weight, and not pushing the engine beyond its limits.
Additionally, it’s important to drive at a steady speed and avoid excessive idling, which can cause the engine to overheat.
3. Check Coolant Levels Regularly
Checking the coolant levels regularly is another important step in preventing car overheating. Coolant levels should be checked at least once a month and more often during hot weather.
The coolant should be between the minimum and maximum marks on the coolant reservoir. If the coolant level is low, it could indicate a leak in the coolant system.
4. Heed Warning Signs
If a car is showing signs of overheating, such as the temperature gauge reading high, steam or smoke coming from under the hood, or warning lights on the dashboard, it’s important to take immediate action.
Stopping the car and turning off the engine as soon as possible can help to prevent severe damage to the engine and other components.
Read: Catalytic Monitor Incomplete
Conclusion
Car overheating and not starting can be caused by various issues, such as engine damage from overheating, transmission damage, ignition system problems, fuel system problems, low engine oil, a bad head gasket, and a damaged valve cover gasket.
It is important to address the issue early to prevent more severe damage and costly repairs.
Regular maintenance, proper use of the vehicle, checking coolant levels regularly, and heeding warning signs can help prevent the car from overheating and not starting.
