TIAGO

1.05L REVOTORQ ENGINE

Components :

A. Radiator :

The radiator is a heat exchanger that is used to dis-

sipate the coolant heat. A radiator fan is used to

create forced air circulation.

Radiator consists of radiator core, inlet tank and an

outlet tank.

Cores are usually made of aluminum. The core has

two sets of passages, a set of tubes and a set of

fins attached to the tubes. The tubes run from inlet

tank to outlet tank. Coolant flows through the tubes

and air flows between the fins. The atmospheric air

passing between the fins carries away the heat,

which lowers the temperature of the coolant.

B. Auxiliary Tank :

As the engine cools down the system pressure falls

down and vacuum is formed. The vacuum valve in

radiator cap opens and allows the water from the

Auxiliary tank to go back into the radiator. Thus the

system does not have any coolant loss during nor-

mal operation.

C. Thermostat :

The thermostat controls the flow of coolant as fol-

lows.

1. During a cold start, thermostat does not allow

coolant to flow to radiator since it is closed; in-

stead the coolant flows through bypass outlet

back to the engine .Thus short circuiting of radia-

tor which helps in attaining engine working

temperature in a very short period.

2. As soon as the coolant temperature reaches the

opening temperature of the thermostat, the

thermostat valve starts opening gradually and

coolant starts flowing to the radiator. At the

same time the thermostat by-pass starts closing

gradually.

3. As the engine working temperature reaches

thermostat full open temperature, the thermostat

valve opens fully. In this condition maximum

quantity of engine coolant flows from radiator to

water pump.