7 Causes of Car Temperature Rising And Car Engine Overheat

The car's cooling system keeps the engine temperature stable and prevents it from overheating. If you notice significant white smoke, rising temperature, or a high reading on the gauge, it may indicate a problem with the cooling system. For some vehicle models, the engine temperature warning light will light up if the engine temperature is at a high level (the needle is in the red zone).

Engine temperatures that are too high usually occur due to damage to some of the engine components or components of the cooling system itself. Why does the car temperature rise? In general, car engine overheating issues can occur due to several reasons:

1. Car Thermostat Broken Or Not Working

High car temperatures are often due to a damaged thermostat, which controls coolant flow through the engine. If the thermostat malfunctions, it can cause the engine to overheat by restricting coolant flow. When the valve opens too little or fails to open at all, it disrupts the coolant cycle, leading to insufficient coolant supply and eventually, an overheated engine.

2. Defective Radiator Fan

The radiator fan, powered by an electric motor, ensures proper airflow through the radiator. Mechanical damage to the motor can impair the fan's function, causing the engine to overheat. This issue is often noticeable when the vehicle is static or stuck in traffic, where external airflow is limited.

Typically, the engine temperature drops when the vehicle is moving due to increased airflow through the radiator fins, which cools the coolant. Radiator fan damage can arise from various factors, including:

• Damage to the fan motor – the carbon brush on the fan motor is worn out.

• Radiator fan motor circuit wiring system problems.

• Burned, loose or broken fuses.

• Damage to the relay.

• Damage to the switch or car temperature sensor.

3. Leaking Head Gasket Problem

A little bit on the technical side of things, a leaking head gasket can allow cylinder gas to enter the coolant channel. Hence, increasing its pressure when the engine is running. This high-pressure forces coolant into the reservoir, which in turns reduces the coolant in the channel and potentially causes the engine to overheat.

4. Air Bubbles in Coolant

With regards to point no.3, air bubbles can form in the coolant due to gas leak from a faulty head gasket. This can increase pressure and disrupt the engine cooling process, potentially causing valve and thermostat failure (back to point no.1). These bubbles often appear after changing or emptying the coolant. To fix this, it is recommended to do a water bleeding procedure first or purging after replacing the coolant.

5. Clogged, Dirty Car Radiator