Components Radiator & Fan Shroud Assy 1. The radiator is a heat exchanger that is used to dissipate the coolant heat. A radiator fan is used to create forced air circulation. Radiator consists of radiator core, inlet tank and 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. Auxiliary Tank 2. The radiator cap controls the system pressure to 1.4 kg/cm2. Once the pressure exceeds 1.4 kg/cm2 the cap lifts off the seat and the coolant is allowed to escape into a auxiliary tank. Thermostat 3. The thermostat controls the flow of coolant as follows During a cold start, thermostat does not allow • coolant to flow to radiator since it is closed; instead the coolant flows through thermostat bypass outlet back to the engine. Thus short circuiting of radiator which helps in attaining engine working temperature in a very short period. 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. As the engine working temperature reaches • thermostat full open temperature, the thermostat valve opens fully and thermostat bypass valve closes completely. In this condition maximum quantity of engine coolant flows from radiator to water pump. Testing Parameters: Thermostat start open temperature is 880±20C • at 0.1 mm travel. Full open temperature is 1020C at 8mm (Min.) • travel. ENGINE 1.2L BSVI PHASE-2 81
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