Do you drive your car on a hot day and wonder why engine does not overheat? The engine gets very hot when you drive, but your car keeps running normally. Actually, radiator makes this possible.
Today, we have discussed how a car radiator works to move heat away from a vehicle engine. You will also learn about faulty radiator symptoms and how you can keep your car radiator in good condition.
Parts of Car Radiator
Many people ask what does a radiator look like? A car radiator is a flat and rectangular metal unit. It has many thin fins and small tubes. The radiator has several other parts and all work together as a single unit to keep your car engine cool.
| Components | Function |
| Core | Transfers heat from the coolant to air |
| Pressure cap | Keeps cooling system under the correct pressure |
| Inlet tank | Receives hot coolant from engine |
| Outlet tank | Collects cooled coolant and sends it back to engine |
| Radiator hoses | Carry coolant between engine and radiator |
| Cooling/radiator fan | Pulls air through radiator to remove heat |
| Radiator fins | Increase surface area for faster heat release |
| Water pump | Circulates coolant through engine & radiator |
| Thermostat | Controls when coolant flows to radiator |
How Do Car Radiators Work?
1. Engine Creates Heat
When you drive your car, the engine burns fuel to create power. This process creates a lot of heat. Further, friction between moving engine parts also adds more temperature. If the cooling system does not remove this heat, the engine can overheat and suffer serious damage.
2. Coolant Will Absorb Heat
Now the job of coolant starts. The water pump will push coolant through passages around the hot engine parts. The cooling system liquid absorbs the heat from these surfaces as it flows. It is obvious that if the coolant picks up more heat, its temperature will rise too. Therefore, the hot coolant then flows out of the engine through the radiator hose and moves toward the radiator.
3. Hot Coolant Enters Radiator
After the engine fluid absorbs heat from the engine, the water pump sends the heated coolant toward the radiator through the upper radiator hose. As a result, this hot liquid will enter the radiator through the inlet tank.
Inside the radiator, the warm coolant passes through many small tubes in the radiator core. These pipes have thin metal fins around them. From here, the radiator will start removing heat from the coolant.
4. Radiator Releases Heat
When high-temperature coolant moves through the tubes, the fins will take heat from the liquid. Moreover, the air will pass over the fins and carry the heat away from the radiator.
Suppose you move your car, air will enter through the front grille and then pass through the radiator. But if you stop or idle in traffic, the cooling fan pushes air through the radiator to cool down the coolant. This process lowers the coolant temperature before it returns to the engine.
Related: Is it normal for my radiator fans to be constantly turning on and off?
5. Coolant Cools Down
After the radiator removes heat, the coolant temperature will drop and it becomes cool. The cooler liquid then collects in the radiator tank. Once the cooling system liquid reaches the outlet tank, it has cooled enough to return to the engine and pick up more heat.
6. Finally Coolant is Returned To Engine
At this stage, the radiator cools down the coolant successfully. So, the water pump will move it back toward the engine through the lower radiator hose.
The cooler fluid flows through the engine passages. Now it is ready to take in heat again. This cycle keeps repeating until your car engine runs. Overall, this precise working process maintains a safe engine temperature.
Role of Thermostat: The role of thermostat is to control flow of coolant toward the radiator. In case the engine is cold, it stays closed so the engine can warm up quickly. But if the engine reaches its normal operating temperature, the thermostat will open and allow the heated coolant to flow into the radiator.
Does a Car Radiator Affect AC?
Yes, several radiator problems can affect your car’s air conditioning performance. The car radiator and air conditioner are separate systems, but they work near each other. Both of them depend on effective heat transfer.
The radiator uses coolant to remove heat from the engine. But the AC system uses refrigerant to cool and dehumidify the cabin air. A faulty radiator can affect AC performance indirectly. Suppose the radiator cannot remove enough heat. As a result, the temperatures under the hood can rise and reduce AC efficiency.
Where is the Radiator in a Car?
If you open your car’s hood, you need to look toward the front of the engine compartment. You will mostly see the radiator present behind the front grille. As we told you, you will find it a flat and rectangular panel with many thin fins. There are also coolant hoses that connect the radiator to the engine.
Can I Put Water in the Radiator Instead of Coolant?
Yes, you can use plain water in your radiator. But this approach is only recommended as a temporary solution if you are in an emergency. For example: if you have a coolant leak and need to reach a repair shop, then you can absolutely put water in the radiator.
We advise you to use distilled water if possible. You should replace the water with the correct coolant mixture as soon as possible. Otherwise, minerals in tap water can cause deposits and blockages over time.
Related: You can further read this reddit post to know the thoughts of experienced drivers and mechanics on the use of water in a car radiator instead of coolant.
Signs of a Failing Radiator
A failed radiator can affect the ability of your car engine to control heat. In this scenario, you will notice several warning signs when you are driving or checking your car. These are some of the very obvious symptoms of a nonfunctional radiator.
- Coolant leaks under the vehicle
- Engine overheating
- Low coolant levels
- Rusty or dirty coolant
- Visible radiator damage
- Damaged or bent radiator fins
- Non-functional radiator fan
- Strong coolant smell
- Steam from engine bay
Safety Note: If you notice these signs, we recommend you to check the cooling system before you continue driving. Otherwise, this situation can lead to more engine damage.
Why do radiators go bad? There are multiple reasons behind the failure of the radiator. Common causes are corrosion, physical damage, clogging, coolant leaks, fan failure or pressure problems. Further, low coolant or a leaking hose can also reduce cooling. Any of these problems can make the engine overheat and damage the radiator.
Helpful: Radiator cools too quickly
Car Radiator Maintenance
If you want to keep your vehicle cooling system functional and durable, the most important thing is to maintain the radiator. This way, you can prevent various engine/radiator issues as well as avoid costly repairs. For this purpose, we advise you to follow these tips.
- You have to check radiator and make sure engine is at the normal temperature.
- Timely replace radiator hoses (recommended interval is after every 36000 miles).
- You must regularly monitor engine coolant level.
- Clean your car radiator at least after every 30000 km or 12 months.
- You can inspect radiator hoses for cracks or leaks each time you change engine oil.
- Check for stray electrical currents to prevent radiator corrosion.
- It is advised to use a 50:50 coolant-antifreeze mix so you can prevent freezing and corrosion.
To Conclude
This is how a radiator in a vehicle operates to regulate temperature and prevent engine overheating. Modern radiator designs use better materials and technology to improve cooling and durability.
Regardless of car radiator properties or premium design, you still need to maintain it if you don’t want your car engine to stop working. So we can say that radiator is the central component of your vehicle’s cooling system.
FAQs
How Many Radiators Does a Car Have?
Most standard cars have one main radiator to cool the engine. However, some vehicles also use other heat exchangers for systems such as the transmission, engine oil or air conditioning.
Can My Vehicle Run Without a Radiator?
You should not drive a car without a radiator for more than a minute or two. Otherwise, it will lead to engine overheating and potentially seize within minutes. Our recommendation is to get the vehicle towed rather than risking expensive engine damage.
Can You Drive With a Broken Radiator Fan Blade?
It is not safe to drive a vehicle if the radiator fan blade is defective. This can cause strong vibrations or lead to engine overheating. If you are in an emergency, you can drive a short distance, but turn off the A/C and keep checking the temperature gauge.
How Long Can You Drive With a Cracked Radiator?
You should drive only a few miles with a cracked radiator. Keep in mind, it is only allowed if the engine temperature stays within the normal range.
When Should You Flush a Radiator?
You should flush your car radiator every 30000 to 50000 miles or every 3 to 5 years. However, always follow your vehicle manufacturer’s recommended schedule.
