Reasons for car overheating: Know How to fix It

Low Coolant Levels

Cars can overheat due to low levels of coolant. This liquid is necessary for engines to remain calm. When classes are diminished, the machine cannot keep its temperature steady, and the car overheats.

Low coolant could be caused by leaks or short trips that don’t give the engine time to heat up and cool down. Here, we’ll discuss the signs and causes of low coolant and how to address them.

overheating car

Check the coolant reservoir.

The coolant reservoir is found in the engine bay. You can easily spot it by its color or labeling. It’s usually bright yellow, green, orange, or pink. This helps keep a suitable temperature of liquid coolant in the engine so no damage is caused by overheating.

To check the coolant level, turn off the engine and let it cool down. Then open the hood and remove the reservoir’s cap. If the fluid is below the line or looks discolored, you must top up the liquid. If it’s been over five years since you last changed the antifreeze, you may have to flush and replace it. If you don’t feel comfortable doing this, ask a professional technician.

Also, check for leakage from hoses leading into the radiator, or any other part of the cooling system, like gaskets, seals, and clamps. This will help diagnose an issue with an overheating vehicle system.

Check for any visible leaks.

Check for signs of coolant leakage if you suspect your car is overheating. Look for liquid pools under your vehicle or colorful patches on the pavement. Check for wet spots on hoses, radiators, and engine areas.

Inspect all radiator hoses for cracks, brittle sections, and swelling. These can be hard to see, so feel them with your fingertips from different angles. The cap at the top of your radiator could also be causing a coolant leak if it is corroded or no longer fits securely. Get a new seal and gasket that matches your car’s model year. Follow instructions for tight-fitting.

Radiator Fan Malfunction

Rad-fan malfunction is the leading cause of cars overheating. Rad fans assist in keeping the engine cool and keep the engine temperature regulated. If the rad-fan isn’t working, the engine temp increases rapidly.

This article will discuss the effects of rad-fan malfunction, what causes it, and how to fix it:

Check the radiator fan

If your car is overheating, check the radiator fan. It helps draw air and cool the engine. It can be manual or electric. Diagnose and repair it quickly to avoid further problems.

  • Manual Radiator Fans: Check cables, connections, and blades for wear or damage. If damaged, install a new one.
  • Electric Radiator Fans: Air comes outside and delivers to the engine bay. Check connections, dirt, and debris on blades. Clean with compressed air and check the fuses in the fuse box.

Use a voltage meter/tester to measure electricity from an electric radiator fan motor. This provides valuable info when pinpointing cooling system problems that can cause overheating.

Check the fan belt

The fan belt is an essential part of any cooling system. It controls the radiator fan assembly. The belt needs to have tension, but it mustn’t be too tight. If the belt moves more than an inch when you press your thumb against it, it’s time to replace it.

If you use the wrong type of belt or install it incorrectly, it can cause accelerated wear. To prevent belt damage and slippage, check the pulleys are aligned. Also, ensure no fraying, cracking, or severe weathering on the belt surface. The radiator fan won’t spin fast enough to cool the engine if not fixed quickly. This can cause it to overheat.

Thermostat Malfunction

A thermostat malfunction can cause car overheating. It’s a device that regulates engine temperature. It’s near the top of the engine block. If it’s not functioning correctly, it won’t be able to regulate temperature. This leads to excessive heat and car overheating.

Learn more about what a thermostat malfunction can cause and how to identify it:

  • What can it cause
  • How to identify it

Check the thermostat

The thermostat is usually found in the water pump housing on the side of the engine. Depending on the car model, it can be placed in other places. Its job is to regulate temperature when driving. It opens to let coolant in when the temp rises. A faulty thermostat might stay closed, blocking coolant flow and making your car overheat.

To check your thermostat:

  1. Open the car’s hood. Find the thermostat according to the vehicle user manual.
  2. Unscrew any fasteners or hoses attached to it.
  3. Use a thermometer or multimeter to test the cold and hot radiator hose connected to the water pump housing.
  4. If the difference is insufficient, get a new part from an auto store.
  5. Secure all fasteners and hoses after the new part is installed.

Check the coolant temperature sensor.

The coolant temperature sensor, or the ECTS, tells the computer its location. Malfunctioning could cause the car to overheat or break down. To diagnose if this is the problem, try cooler temperatures.

Find the coolant temperature sensor near where the coolant enters your motor. See if anything blocks it from working correctly, like air pockets or sediment. Use a multimeter with probes or clips to check for shorts in the wiring. You may need help if it’s tricky.

If nothing’s wrong with the switch and no shorts, check the cooling system and components like hoses that could cause overheating:

  • Cooling System
  • Hoses

Clogged Radiator

A clogged radiator is one of the significant reasons for car overheating. The tubes in the core become blocked and stop the coolant from flowing from the engine to the radiator. This pressure can cause leaks, expand the radiator and cause severe engine issues. Additionally, a clogged radiator creates a void in the cooling system, which leads to high engine temperatures.

Other causes for car overheating? Let’s explore them!

Check the radiator for any blockages.

The radiator is a vital part of your car’s cooling system. It’s essential to keep it clear of blockages so the coolant can flow. Poor maintenance and age can cause blockages. Faulty thermostats can stop warm air from reaching the cabin when it’s cold. Debris near or inside the radiator grill can block airflow, leading to overheating. Internal tanks may have corrosion or rust. Clogs can happen if non-factory additives are in older vehicles’ cooling systems. Low antifreeze levels can reduce coolant in the radiator and stop heat transfer.

Before investigating other issues, check for blockages such as leaves or dirt in the grill. This might be an easy fix:

  • Check for debris near or inside the radiator grill.
  • Ensure there are no non-factory additives in the cooling system.
  • Check the levels of antifreeze in the radiator.

Check the radiator hoses for any blockages.

Your car’s radiator is an integral part of the cooling system. It transports coolant, regulates temperature, and controls internal heat. Clogged hoses can cause your vehicle to overheat, as coolant can’t flow properly.

To prevent radiator issues and to overheat, check the condition regularly. Check both hoses connected to the engine for blockages or cracks. Remove objects with needle-nose pliers or tweezers if present. If you notice bulging or softening, replace them.

Test that coolant lines are clear by running a thin wire inside each hose. Pay attention to where they join with the core. Don’t cause too much damage!

These steps help detect clogging issues before they become significant problems.

Leaky Hose

Your car may be overheating due to a leaky hose! Antifreeze can escape the system, and air can enter the coolant. This reduces the coolant’s flow, causing your car to overheat.

Coolant or steam from the radiator cap is the most noticeable symptom of a leaky hose.

Let’s look deeper into how a leaky hose causes overheating and what you can do to fix it:

Check the radiator hoses for any leaks

The radiator hose is an essential part of keeping your vehicle from overheating. It carries coolant between the engine and radiator, cooling the engine’s temperature. Signs you may have a cracked or loose hose are a high-temperature dashboard gauge, steam coming out of your engine, and boiling noises from under your hood.

It’s essential to check both upper and lower radiator hoses regularly. Even if there are no signs of wear, check for leakage or cracked areas around the Sealer Cap or Clamps. Over time, rubber components can degrade. If you see any leaks or damage, replace the hoses. Also, check for mineral deposits or fuel contamination.

If these issues occur, always replace the upper and lower radiator hoses. This is for safety reasons. Also, check for other leaks that extreme temperature changes may have caused. Deal with them swiftly to prevent further damage.

Check the water pump for any leaks.

A water pump pushes coolant throughout the car’s engine and back. Over time, these gaskets and hoses may become weak from heat. They can crack or tear, causing a coolant leak. This leak stops coolant from passing through the system. Thus, the engine gets too hot, which can damage other components.

You should get your car serviced to check for water pump issues. If needed, they can be fixed or replaced. Don’t ignore even minor leaks!

Frequently Asked Questions

What are the most common reasons for a car to overheat?

The most common reasons for a car to overheat include a low coolant level, a faulty thermostat, a malfunctioning radiator fan, a damaged water pump, or a blocked radiator.

What should I do if my car is overheating?

If your car is overheating, you should pull over and turn off the engine as soon as possible. Check the coolant level and look for any leaks. If the coolant level is low, add more coolant. If you can’t find the source of the problem, call a mechanic or tow the car to a service center.

How do I prevent my car from overheating?

To prevent your car from overheating, check the coolant level regularly and check for leaks. Ensure the radiator and cooling fan are working properly, and the thermostat is functioning correctly. Regularly servicing your car would be best to ensure all components work well.