VW Passat B5

since 1996 release

Repair and operation of the car



Foltsvagen Passat B5
+ Maintenance instruction
+ 1. Maintenance
+ 2. Engines
- 3. Cooling system
   3.2. Dolivka of cooling liquid
   3.3. Composition of mix of cooling liquid
   3.4. Replacement of cooling liquid
   3.5. Thermostat
   3.6. Radiator
   3.7. Water pump (engines 1,8-I and 1,6-I ADP)
   3.8. Cooling system hoses
   3.9. Malfunctions of the cooling system
+ 4. Fuel system
+ 5. Engine management
+ 6. Exhaust system
+ 7. Transmission
+ 8. Running gear
+ 9. Steering
+ 10. Brake system
+ 11. Body
+ 12. Heating, ventilation
+ 13. Electric equipment






3. Cooling system

3.1. General information

GENERAL INFORMATION

Elements of the cooling system of the engine 1,6-I/1,8-I

1 – heater radiator;
2 – returnable pipeline;
3 – throttle case;
4 – broad tank;
5 – oil heat exchanger;
6 – inlet collector;
7 – top hose of a radiator;
8 – lower hose of a radiator;
9 – radiator;
10 – pipeline of supply of cooling liquid;
11 – water pump / thermostat;
12 – block head cylinders/block of cylinders of the engine;
13 – connecting branch pipe

Elements of the cooling system of the diesel engine

1 – heater radiator;
2 – oil heat exchanger;
3 – broad tank;
4 – top hose of a radiator;
5 – lower hose of a radiator;
6 – radiator;
7 – water pump;
8 – block of cylinders of the engine

Units of the cooling system of the engine 1,8-I

1 – screw, 20 Nanometers;
2 – lower casing of a gear belt;
3 – sealing ring. At  installation it is necessary to use a new sealing ring;
4 – water pump. The thermostat  is located in the case of the water pump;
5 – the heat exchanger of oil fastens on the holder of an oil filter;
6 – the fixing brackets;
7 – electric socket;
8 – sensor of temperature of cooling liquid. The sensor of temperature of cooling liquid is intended for a control system of the engine and the index of temperature;
9 – cap;
10 – to a heater radiator;
11 – connecting branch pipe;

12 – bolt, 10 Nanometers;
13 – the pipeline for cooling liquid;
14 – throttle case;
15 – from a heater radiator;
16 – the pipeline for cooling liquid;
17 – cover;
18 – sealing ring;
19 – broad tank;
20 – a hose for cooling liquid;
21 – arm. The arm is intended for fastening of the mechanism of a tension of a poliklinovy belt, a viskomufta of the fan of a radiator, a krylchatka of the pump of the amplifier of steering and the generator.
22 – belt;
23 – krylchatka of the fan of a radiator

The fan and radiator of cars with four-cylinder engines

1 – krylchatka;
2 – visko-coupling;
3 – pulley;
4 – arm;
5 – forward cross-piece;
6 – radiator curtain;
7 – consolidation;
8 – radiator

The cooling system of tight type turns on the water pump with the drive from an auxiliary driving belt, the radiator fan with the thermoviscous coupling, a radiator, a broad tank, the thermostat and a radiator of a heater, and also hoses and switches. At start of the cold engine cooling liquid circulates around 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 increases. Intake of cooling liquid through a radiator is closed that provides the closed thermostat. When cooling liquid reaches 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 with a stream of counter air. The thermoviscous coupling of the fan of a radiator turns on depending on air temperature behind a radiator. At achievement of the predetermined temperature the valve in the coupling opens and the thermoviscous coupling puts a krylchatka of the fan in action. When temperature of cooling liquid is ranging from +92 °C to +98 °C the thermal sensor includes the first step of the fan of a radiator and the fan rotates with the reduced speed. At a temperature of cooling liquid from +99 °C to +105 °C the thermal sensor turns on the radiator fan on the second step and the fan rotates with the maximum quantity of turns.

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


Prevention

When opening a cover of a broad tank on the hot engine it is necessary to be careful as the coming-out vapors can lead to severe burns. For this purpose close a cover of a broad tank a thick layer of fabric and slowly unscrew a cover before emergence of the 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 plentiful amount of water.