since 1997 of release

Repair and car operation

Foltsvagen Golf 4
+ 1. Maintenance instruction
+ 2. Engine
- 3. Cooling system
   3.1. Dolivka of cooling liquid
   3.2. Structure of a mix of cooling liquid
   + 3.3. Replacement of cooling liquid
   + 3.4. Thermostat
   + 3.5. Radiator and radiator fan
   + 3.6. Water pump of petrol engines
   + 3.7. Water pump of diesel engines
   3.8. Hoses of system of cooling
   3.9. Malfunctions of system of cooling
+ 4. Fuel system
+ 5. Exhaust system
+ 6. Ventilation and heating system
+ 7. Coupling
+ 8. Transmission
+ 9. Suspension brackets and power shafts
+ 10. Steering
+ 11. Wheels and tires
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment and electroschemes

3. Cooling system


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

2–oil heat exchanger;
3–water pump / thermostat;
4–block head cylinders / block;
5–broad tank;
7–inlet collector;
8–heater radiator;
9–radiator of an automatic transmission

Elements of system of cooling of the diesel engine

2–oil heat exchanger;
3–water pump / thermostat;
4–block of cylinders;
5–broad tank;
6–inlet collector;
7–a radiator for a retsirkulyatsiya of exhaust gases. Only ALH engines with an automatic transmission;
8–heater radiator;
9–average pipe of system of cooling;
10-the heat exchanger for cooling of transmission oil;
11-top hose of a radiator,
12-bottom hose of a radiator

The system of cooling of tight type turns on the water pump, the radiator fan, a radiator, a broad tank, the thermostat and a heater radiator, and also hoses and switches. At start of the cold engine cooling liquid circulates round the block of cylinders and a head of the block of cylinders. Warm cooling liquid passes through a heater radiator to the water pump. As cooling liquid when heating extends, its level in a broad tank raises. Intake of cooling liquid through a radiator is closed that provides the closed thermostat. When cooling liquid will reach the predetermined temperature, the thermostat opens and hot cooling liquid passes through a hose to a radiator. As cooling liquid passes through a radiator, there is its cooling by a stream of counter air. When the temperature of cooling liquid is in limits from +92 ° With to +98 ° With, the temperature-sensitive element includes the first step of the fan of a radiator and the fan rotates with the reduced number of turns. At temperature of cooling liquid from +99 ° With to +105 ° About a temperature-sensitive element turns on the radiator fan on the second step and the fan rotates with the maximum quantity of turns.

The fan with an electric drive can turn on and after ignition switching off. Therefore at work on the hot engine for the period of work it is necessary to disconnect the electric socket from the fan engine.


When opening a cover of a broad tank on the hot engine it is necessary to be careful, as leaving pairs can lead to strong burns. For this purpose close a cover of a broad tank a thick layer of a fabric and slowly unscrew a cover before emergence of a hissing sound. After the hissing termination slowly unscrew and uncover a broad tank.

Do not allow hit of cooling liquid on clothes and a paint and varnish covering of a body. Otherwise wash out a surface a large amount of water.