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Car Won’t Start After Overheating

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Whenever your engine becomes overheated and the vehicle won’t start, this is an obvious cause for concern. Here’s what you should do if your car refuses to start after overheating.

What Causes A Car Engine To Overheat?

The engine typically overheats because there is something wrong with the cooling system. Whenever this occurs, the heat generated by combustion can be so intense that it can melt and ultimately warp the engine block itself. This can result in massive damage to the engine.

In order to prevent further problems, turn off your air conditioner and roll the windows down. Then, pull over to the side of the road as soon as you can do so safely, and shut off your engine.

There are four potential reasons why your engine overheats, including:

Radiator Damage

The radiator is where your coolant ultimately cools down. So, if the radiator becomes damaged, the fluid can get too warm. This is due to the fact that the radiator fan could have burned out, or the radiator has sustained damage from an accident.

Faulty Thermostat

Your thermostat is responsible for controlling the flow of the coolant. When the engine starts, the thermostat valve stays closed and the fluid will not circulate. When the engine reaches its operating temperature, the valve opens for coolant flow. However, a faulty thermostat may remain closed even when the engine is hot.

Water Pump Damage

Coolant is a mixture of antifreeze and water. A water pump circulates the coolant through the engine, which absorbs the extra heat. One problem with the water pump is the coolant flow can become impaired.

Low Or Contaminated Coolant

Even if your pump is working properly, that will not be enough when the coolant itself is contaminated. The build-up of foreign bodies can create worse heat absorption.

Why Won’t My Car Start After Overheating?

Now that the reasons behind the overheating are known, it’s time to deal with starting the engine. If you can’t seem to start your car after it overheats, there are a few reasons why, including:

Car Battery Damage

If the battery is not in good shape, your car is unlikely to start up. If it has become corroded or otherwise damaged, a complete replacement is the only solution.

Blown Head Gasket

This can be a significant cause of a car overheating. Blown head gaskets are made from steel, expanding quickly. However, if they are made of aluminum, they can easily do the opposite under high temperatures. This can lead to total engine failure.

Melted Electric Sensors

Most electric sensors in the vehicle give signals for the electronic unit to function properly. When your engine overheats, the sensors can melt or warp, which prevents the car from starting.

Fuel System Damage

A damaged fuel system is the most likely culprit of an overheated engine failing to start. A faulty system can cause the motor to get hot, producing heat and vapor as a result. This creates much difficulty for the fuel to circulate within the engine.


There are many reasons why a car may overheat, causing the inability to start your car. Some of the issues can be solved by a DIY replacement, while other major issues call for the expertise of the auto repair professionals.

Heath’s Auto Service In Cottonwood, AZ

At Heath’s Auto Service, our comprehensive range of services covers everything from routine maintenance to complex repairs. Our certified technicians are skilled in handling oil changes, brake inspections, engine diagnostics, tire rotations, and much more. Whether it’s a minor tune-up or a major overhaul, trust us to get you back on the road with confidence. Contact our team at Heath’s Auto Service today!


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