The most common reasons why cars overheatBelow we list the most common reasons.
1. A leak in the cooling system - this can cause air to enter the system. This air rises within the cooling system and as a result will form an airlock. As this large air bubble is trapped, it prevents the coolant from circulating around the engine, and as a result of this, the engine overheats.
2. Any obstruction in the coolant system As above, this will prevent the circulation of coolant. Common reasons for a blockage in the coolant system include:
- A faulty thermostat
- Build up of mineral deposits
- Invasion by foreign objects
3. Damaged water pump This is a common problem. When the pump stops, so does the coolant, and the engine will inevitably overheat.
4. Incorrect concentration of coolant If the concentration used is not correct, then this can be a huge problem, especially in the winter months. What can happen is that the coolant can solidify, causing a hard gel like mass, that obviously will not be able to circulate around the system, causing the engine to overheat.
Ways you can try to cool the engine down
There are many things that you can do to cool the engine down if you find that you are on the road and the engine has overheated. The first point of action should be to open all windows and turn off the air conditioning. Doing so will speed up the engine cooling process. The next step is to switch on the heater, as this will divert heat away from the engine. If you see that the engine temperature is rising, then it is a good idea to top the engine up with antifreeze, if you have it, or alternatively water, as a short term measure to get you home. Most problems occur due to a lack of coolant in the system.