Most car engines are cooled by water. The water flows around the engine and then passes through the radiator. It then passes through the water pump and around the engine again.
Fig. 1
Here are the stages:
1. Water flows around the engine. The engine is cooled and the water is heated.
2. The hot water enters the radiator through the top hose.
3. It flows down through the radiator. Here it is cooled by air.
4. The cool water leaves the radiator through the bottom hose.
5. The water is pumped around the engine again. Fig. 2
Fig. 3
Look at Fig. 3. Air is pulled through the radiator by a fan. This fan is turned by a belt, which is driven by the engine.
2. What are the objects in the diagrams called?
Example: (a) is called a radiator.
3. Answer these questions:
Look at Fig. 2. Is the water hot or cold at point “1”? At point “2”?
What cools the engine?
What makes the water hot?
What makes the water cool?
What pumps the water round the engine?
What pulls air through the radiator?
What does the belt turn?
What drives the belt?
4. Check the right answers:
1.
The water flows around the radiator and then passes through the engine.
False
True
2.
Water flows around the engine. The engine is heated and the water is cooled.
3.
The hot water enters the radiator through the bottom hose.
4.
The cool water leaves the radiator through the bottom hose.