Toyota Land Cruiser 100/Amazon, Lexus LX 470

since 1997 of release

Repair and car operation

Systems of cooling of the engine, salon and air conditioning heating

General information

System of cooling of the engine

The scheme of circulation of cooling liquid (engine 2UZ-FE)

All models of cars considered in the real Management are equipped with system of cooling of the engine working at superfluous pressure with thermostatic management of circulation of working liquid. The water pump of rotor type is fixed on the block of the engine and provides pumping of cooling liquid through an okhladitelny path of the last. The stream of liquid washes regions of an arrangement of each of cylinders in the block then goes to a back part of the engine. Laid in molding of the block and a head of cylinders okhladitelny channels provide intensive cooling of inlet and final ports, areas of installation of spark plugs and directing plugs of final valves (address to an illustration above). The pump fastens to the block and access to it opens after dismantle of a forward cover and a gas-distributing belt.

The Voskozapolnenny thermostat supervises 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. In process of approach of temperature of the engine to normal working value, the thermostat valve gradually opens, connecting to a cooling contour a radiator providing the maximum intensity of a heat-conducting path from a working body (cooling liquid).

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

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

Heating system

The main components of system of heating of salon are the electric fan and the heat exchanger placed in a box-shaped casing of a heater, fixed under the car dashboard. The heat exchanger is connected by means of rubber hoses to system of cooling of the engine. On some models the back heater of salon located under the right forward seat is established. The control unit is built in by functioning of the heater/conditioner of air in the car dashboard. The cooling liquid warmed up in the engine circulates via the heater heat exchanger, giving the to air warmly filling a casing. At inclusion of heating of salon there is an opening of a lamellar zaslonka therefore the internal volume of a casing of a heater incorporates to salon volume. At turning on of the fan the krylchatka of the last starts to banish air submitted to salon via the heat exchanger, providing its intensive warming up.

Air central air

The structure of central air includes the condenser established ahead of a radiator close to the heat exchanger of a heater the evaporator, fixed on the engine block the compressor, and the filtering receiver dehumidifier (accumulator) equipped with the reduktsionny valve of a high pressure. All components are connected among themselves by refrigerator lines.

The fan banishes air arriving in salon through the heat exchanger of the evaporator working in a mode, the return to a mode of functioning of a radiator. The coolant pumped over through the heat exchanger begins to boil and, evaporating, selects at air surplus of heat. The temperature in salon thus decreases to demanded comfortable value (at the choice of the operator). The compressor supports coolant circulation in system, pumping over the warmed-up liquid via the condenser where it is cooled and arrives back in the evaporator.