5. Cooling system and heating

General information

Engine cooling system

All models of the cars considered in the present manual are equipped with the engine cooling system working with an excessive pressure with thermostatic management of circulation of working liquid (see illustrations below). Rotor type the water pump is fixed on the block of the engine and provides pumping of cooling liquid through the last. The stream of liquid washes regions of an arrangement of each of cylinders in the block and goes to a back part of the engine. The cooling channels laid in casting of the block and a head of cylinders provide intensive cooling of inlet and final ports, areas of installation of spark plugs and the directing plugs of final valves.

The Voskozapolnenny thermostat controls the working temperature of the engine in the course of its warming up. The first minutes after start of the cold engine the thermostat remains closed, preventing thereby circulation of cooling liquid through a radiator. When temperature of the engine reaches normal working value, the valve of the thermostat opens, connecting the radiator providing the maximum intensity of the heat sink from a working body (cooling liquid) to a cooling contour.

The cooling system is closed by the tight cover of a radiator capable to maintain a certain excessive pressure that provides increase in a boiling point of cooling liquid and, respectively, efficiency of the heat sink through a radiator. At excess by internal pressure in system of some certain value, the sprung plate of the radiator of the safety valve which is built in in a cover rises over the saddle, providing an overflowing of excess of cooling liquid on a connecting (overflow) tube in a broad tank. In process of cooling of system liquid from a tank automatically comes back to a radiator.

Having added cooling liquid in system it is made through a mouth of a broad tank which at the same time acts also as the receiver accumulating in itself the excess of liquid which is forced out from a radiator.

In view of the listed features of the design, such cooling system received the name closed as in it any functional losses of cooling liquid are excluded.

System of heating

The main components of system of heating of salon are the electric fan and the heat exchanger located in a box-shaped casing of a heater. The heat exchanger by means of rubber hoses is connected to the engine cooling system. The control unit of functioning of the heater/conditioner of air is built in in the car dashboard. The cooling liquid warmed in the engine circulates via the heater heat exchanger, giving the to the air which is warmly contained in a casing. At inclusion of heating of salon there is an opening of the lamellar gate and the internal volume of a casing of a heater connects to the volume of salon. At turning on of the fan the krylchatka of the last begins to banish the air coming to salon via the heat exchanger, providing its intensive warming up.

Air conditioning system

The condenser installed before a radiator, the evaporator, close to the heater heat exchanger, fixed on the engine block the compressor and a receiver dehumidifier equipped with the reducing valve are a part of system. All components are connected among themselves by refrigerator lines.

The fan banishes the air coming to salon via the evaporator heat exchanger working in the mode, the return to the mode of functioning of a radiator. The coolant which is pumped over via the heat exchanger, evaporating, selects excess of heat at air. Temperature in salon at the same time reduces to comfortable value (at the choice of the operator).

Arrangement of components of the cooling system in a motive compartment of the car (Honda Civic)

1 — Heating hoses
2 — Nizhny Novgorod a radiator hose
3 — the Broad tank
4 — the Top radiator hose

5 — a radiator Cover
6 — cooling system Fans
7 — the Refrigerator hose To/in
8 — the K/V Compressor

Arrangement of components of the cooling system in a motive compartment of the car (Acura Integra)

1 — Nizhny Novgorod a radiator hose
2 — the Top radiator hose
3 — the Broad tank
4 — a radiator Cover

5 — cooling system Fans
6 — the Refrigerator hose To/in
7 — the K/V Compressor