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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Volkswagen Golf IV (1997 release)

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Volkswagen Golf 4
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Golf 4
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Cooling system
Topping up the coolant
Composition of the mixture coolant
Substitution coolant
Thermostat
The radiator and radiator fan
The water pump of petrol engines
Water Pump Diesel Engine
Coolant hoses
Malfunction of the cooling system
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Cooling system



The cooling system of the petrol engine 1,8-I

1 - a radiator;
2 - water heat exchanger;
3 - water pump / thermostat;
4 - cylinder head / block;
5 - expansion tank;
6 - the turbocharger;
7 - the inlet manifold;
8 - a heater radiator;
9 - radiator automatic transmission

The cooling system of the diesel engine

1 - a radiator;
2 - water heat exchanger;
3 - water pump / thermostat;
4 - cylinder block;
5 - expansion tank;
6 - the inlet manifold;
7 - cooler for exhaust gas recirculation. Only ALH engines with automatic transmission;
8 - a heater radiator;
9 - Average tube cooling system;
10 - heat exchanger for cooling a transmission oil;
11 - the upper radiator hose,
12 - the lower radiator hose

The cooling system includes a sealed-type water pump, radiator fan, radiator, expansion tank, thermostat and radiator heating, as well as hoses and switches. When starting a cold engine coolant circulates around the cylinder block and cylinder head. Warm coolant passes through the radiator heater to the water pump. Since the coolant expands when heated, it increases its level in the expansion tank. Receipt of the coolant through the radiator is closed, which provides indoor thermostat. When the coolant reaches a predetermined temperature, the thermostat opens and hot coolant flows through the radiator hose. As the coolant passes through the radiator, it takes a counter-flow cooling air. When the coolant temperature is in the range from + 92 ? C to 98 ? C, the thermal sensor includes a first step of the cooling fan and the fan rotates at a reduced speed. When the coolant temperature is from + 99 ? to + 105 ? C, the temperature sensor comprises a radiator fan for the second stage and the fan rotates at maximum number of revolutions.

Fan power can be turned on and turned off the ignition. Therefore, when working with a hot engine for the time of work is necessary to disconnect the electrical connector from the fan motor.


A warning

When you open the cover of a broad tank on the hot engine must be careful, as the emerging vapors can cause severe burns. To do this, close the cover of the expansion tank with a thick layer of tissue and slowly unscrew the cap until the hissing sound. After the cessation of fizz slowly unscrew and remove the cap from the expansion tank.

Do not allow coolant to clothing and body paint. Otherwise, rinse with plenty of water.






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Topping up the coolant

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