since 1994 release
Repair and operation of the car
+ Cars of the Skoda Felicia brand
+ Maintenance instruction
+ Routine maintenance
+ Repair of the engine
- Cooling systems, heating
General information and precautionary measures
Detachment and replacement of hoses of the cooling system
Removal, check of a state and installation of a radiator
Removal, check of serviceability of functioning and installation of the thermostat
Check of serviceability of functioning, removal, installation, dismantling and assembly of the fan of the cooling system
Check of serviceability of functioning, removal and installation of electric switches and sensors of the cooling system
Removal, installation, dismantling and assembly of the water pump
System of heating/ventilation of salon - the general information
Removal and installation of components of system of heating/ventilation of salon
The air conditioning system - the general information and precautionary measures
Removal and installation of components of the air conditioning system
+ Power supply system
+ Engine electric equipment
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body and finishing of salon
+ Onboard electric equipment
General information and precautionary measuresScheme of the cooling system (carburetor engine of 1.3 l)
On all models of cars of the considered brand the cooling system of the closed type working under pressure is used. Are a part of system the water pump which drive on models of 1.6 l is carried out from a gas-distributing belt, and on others - from auxiliary, the radiator of a cross and line design made of aluminum, the electric fan, the thermostat, the heater heat exchanger, and also all connecting fittings and electric switches. Cold cooling liquid from a radiator on the lower hose comes to the water pump which provides giving it in galleries of the block and a head of cylinders (and also to the heat exchanger of a heater of salon). After selection of heat from the surfaces of cylinders, combustion chambers and saddles of valves, cooling liquid reaches the lower part of the thermostat which in an initial state is closed. Further, cooling liquid passes through the heater heat exchanger then comes back to the water pump.
The function chart of the cooling system of the engine is submitted on an accompanying illustration. The cooling system functions as follows: the centrifugal water pump through the lower radiator hose is taken away cold by cooling liquid from the lower part of a radiator and under a pressure pumps over it through galleries of a water shirt of the block and a head of cylinders, and at the corresponding complete set also via the oil cooler heat exchanger. Having selected heat from cylinders, combustion chambers and saddles of valves, liquid gets to the lower part of the thermostat which valve at a stage of warming up of the engine remains buried, and then opens. Besides cooling of the engine, cooling liquid is used also for heating of interior of the car. For this purpose the path of the cooling system switched on the heater heat exchanger, passing through which, liquid comes back in the block of cylinders.
Until the engine got warm up to some certain temperature, cooling liquid continues to circulate on a short contour, passing only through the block and a head of cylinders, and also through the heater heat exchanger. As soon as temperature of the engine reaches the established value, there is an opening of the thermostat therefore the radiator is connected to a contour of circulation of liquid. In a radiator there is a convective return of heat from liquid to the running air stream which efficiency is defined by the developed area of edges of the heat exchanger of a radiator and speed of the air stream which is flowing round them. It is in case of need provided additional having blown in a radiator due to turning on of the electric fan of the cooling system. On reaching liquid of the lower cavity of a radiator, the cycle is repeated.
The electric fan which functioning the thermosensitive sensor switch of the cooling system operates is installed behind a radiator. As soon as temperature of cooling liquid reaches some established value, there is a turning on of the fan therefore having blown in the heat exchanger of a radiator increases that leads to increase in efficiency of a thermolysis.