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5 Comprehensive Details Of What Causes A Car To Overheat


Have you been searching for what causes a car to overheat? To be factual, a car engine experiencing overheating is above a bummer. The truth is the negative overheating action of a car engine can be extremely serious to leave the vehicle owner on the path of confusion.

It can as well leave the car owner on the repair shop for an exorbitant bill. You will actual discover the reaction if your vehicle is becoming hot.

The light may turn green while sitting in traffic. Your next step is to pray that the traffic breaks to have some fresh air circulating over the car radiator.

With air flowing or circulating over the radiator of your vehicle, the engine temperature unit will go down for a while. Is your quest for what causes a car to overheat?

With the few points enumerated below, you are sure to discover certain things that can make a car to overheat.

Low Coolant:

bad symptoms
A low or reduced coolant level is the most common reason that makes a car engine to experience overheating. Studies have shown that coolant is the basic item that your engine’s cooling system needs to flow and get rid of heat from its compartment.

Your car engine will overheat as heat builds up if there is not enough coolant. If there is no sufficient coolant in the car radiator to transfer heat, no level of operating the heater will help this tedious scenario.

Checking your coolant level is the first thing to do when the vehicle engine is hot. Applying this idea will always help to secure the longevity of your car and its effective operation. Low coolant level is a first sign of a blown head gasket.

Your Vehicle Thermostat Not Effectively Opening:

Overheating at highway velocities is the most common sign of an improper thermostat. At low speeds, your vehicle engine can remain cool. This is simply because it is not working above the normal capacity.

Since it is working at normal speeds, your car engine will not create as much heat. Lots of coolants are needed when the vehicle is running at high speeds.

When there is not enough circulation to experience proper cooling, the thermostat of your car will not open. In this case, you will see yourself like a steam cargo than a sedan moving slowly at the highway.

Electric Fan Failure:

When your electric cooling fan is not working, there is every possibility to cause overheating to your car. When your vehicle is not moving fast enough, the car electric cooling fan gets cooler air from the radiator.

This simple process can be confirmed by keeping your car in an idle status so that the vehicle engine may heat up. Ensure to always check on the temperature gauge, when you always experience an overheating issue in traffic.

Look beneath the hood to confirm if the electric fan is operating, when it begins moving into the danger level. You will have to check out the reason if it is not. There are basically 2 common causes to this effect.

A: Bad/Spoilt Radiator Fan Switch:

When your coolant attains a certain temperature, there’s a switch that signal the cooling fan to come on. To disconnect the wiring harness remains the simplest method to test the switch.

A jumper wire is now run across the harness contacts. In case the starts operating, then you will have to change the switch.

B: Bad/Poor Electric Fan:

When fan motor burns out, it will not come on or operate. You will have to search for your car radiator fan switch to this process. You can go ahead to disconnect the wiring harness.

A jumper wire can be placed in both contacts. This will enable your fan to start operating. By simply turning on the AC, you can also test the fan. When you turn on the AC, your vehicle will activate the cooling fan unit or device at either a high or medium speed.

Clogged/Blocked Radiator:

The car radiator can begin getting clogged or gummed up If your vehicle has more than fifty thousand miles on it.

Simply by flushing or cleaning your radiator yearly will help to overcome clogging negation and other problems related with old coolant. To be realistic, there is not good about a car overheating problem.

Try to resolve the issue quickly if the engine is becoming hot. Even when you are not moving into overheating, a hot car engine can do a lot of damage to itself.

To be certain you are providing sufficient lubrication to the car engine, ensure to check your oil level constantly. Ensure to provide all that can help to get rid of heat buildup.

Broken Fan Belt:

There are several vehicles that still need a good fan belt to operate their engine cooling fan. In case you find a belt joined to your fan, it simply means that your car engine falls into this category.

One amazing thing to know is that your repair will be affordable than the electric option. When your fan belt is broken, you can easily replace it.

Broken fan belt can also lead to car overheating. Ensure to always check if your car fan belt is in the proper condition. Replacement is cheap and can be done anytime you notice overheating.


There are other cogent problems that can cause your car to overheat. It all depends on the condition of your car and how the vehicle is used. With the few points explained in this article, you will agree that your car need proper attention to overcome any problem of overheating.

The comprehensive details of what causes a car to overheat can simply be found in the points explained above. All you have to do is check your car with respect to the conditions above.

You will discover that one or two of the factors in this article may be related to why your car is experiencing overheating. Provided you can discover the problem, finding the right solution remains eminent. You can give it a try whenever there is the problem of car overheating.

Last Updated on: November 2, 2022

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Seth Burgin
Seth Burgin
7 years ago

You could have combustion gases leaking into the cooling system from a bad head gasket, or a bad torque converter can cause the transmission fluid to heat up the cool side of the radiator in radiators with automatic transmission coolers inside them. If it is a “marginal problem” like pulling prolonged uphill grades, a new radiator can also do the trick. You can have no leak, and no flow issues, but over time the aluminum in the radiator oxidizes, and that aluminum oxide is a pretty good thermal insulator, so the air passing over the fins will not take away… Read more »

Seth Burgin
Seth Burgin
7 years ago

I should have said the bonding between the passage tubes and the fins can break down, causing a lack in ability of the radiator to transfer heat from the coolant to the tubes and out to the fins. Bottom line, aluminum radiators will lose efficiency after about 5 years. An aluminum cleaning solution will take the oxide off the fins, which are on the outside of the radiator. Semi-truck mechanics will use aluminum trailer cleaner to wash this oxide coating off, and swear by the stuff, and swear by the practice of using it, but that only solves part of… Read more »

Khayalethu ncwana
Khayalethu ncwana
7 years ago

Hi my Isuzu kb 280 2002 is overheating when i am driving 120km + or uphill in summer please help

rodel ramos
rodel ramos
7 years ago

why my car going to overheat when uphill but if running in the lowland its normal even long distance

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