On models with 1.1/1.3 l engines (figure E:3) The cooling pump is located at the front of the cylinder block and is driven by the timing belt. The main pipe of the cooling system, which approaches the cooling pump from the rear, ensures the return of coolant from the radiator, heater, cylinder block, etc. to the pump.
The thermostat, which limits the flow of coolant through the radiator until the engine reaches operating temperature, is located in the housing on the water outlet pipe at the rear of the cylinder head. The temperature sensor is also located there. The cabin heater and intake manifold heater use engine coolant as a heat source and are integrated into the system between the cylinder head outlet pipe and the coolant pump main pipe.
The radiator has horizontal tubes and is cooled by the air flow that occurs when the car is moving or by an electric fan. The radiator fan is switched on by a thermal switch when the coolant temperature reaches a certain value. The thermal switch is located in the side tank of the radiator.
Some models have a separate expansion tank, which is connected between the radiator and the thermostat housing (figure E:3).
On models with 1.5/1.6/1.8 l engines (figure E:4) the cooling pump is located on the side of the cylinder block and is driven by the generator drive belt. The pump consists of a housing attached to the cylinder block, a pump cover with bearings and an impeller, and a lower branch pipe, under which the thermostat is located.
On 1.8L injection engines, an oil cooler is included in the cooling system (heat exchanger), cooled by the engine cooling system liquid.
The water outlet pipe, connected by a hose to the radiator, is located on the side of the cylinder head. A hose leading to the cooling pump housing is also connected to this pipe. There is another outlet pipe at the back of the cylinder head, from which the liquid flows to the heater and intake manifold. The temperature sensor is also located on this pipe (except for the 1.8L injection engine, where the temperature sensor is located under the outlet pipe on the cylinder head).
It should be remembered that since August 1978 the normal operating temperature of the coolant has been increased, so the thermostats of new engines are not suitable for use in the cooling systems of earlier engines. This also applies to the radiator fan thermostat switch, the sensor and the coolant temperature gauge.
View the original on the website: VWmanual.ru
Visitor comments