Renault Megane, Scenic

Since 1996 of release

Repair and car operation

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System of cooling, heating

Specifications

The basic characteristics

The characteristic	Value
The maximum pressure in system:
Models with the petrol engine:
The engine of 1.4 l       Engines of 1.6 and 2.0 l	1.2 bar 1.6 bar
Diesel models	1.2 bar

The thermostat

The characteristic	Value
Working temperature:
Starts to open at It is completely open at	89°С 101°С
Height of lifting of the valve	7.5 mm

The general description

The system of cooling of tight type (pressure above atmospheric), includes the water pump (it is resulted on 1.4 and 1.6 petrol engines by a gear belt, and on 2.0 l engines and diesel models - an auxiliary belt), an aluminium radiator of a cross-section stream, the electrofan, the thermostat, the heat exchanger of a heater both the connected hoses and switches.
The system functions as follows. The cold cooling liquid from the radiator basis passes through the bottom hose to the water pump which banishes it on channels of the engine and a cooler of impellent oil (where is available). After cooling of cylinders, chambers of combustion and saddles of valves the cooling liquid gets to the thermostat which is originally closed. The cooling liquid passes through a heater and comes back through the block of cylinders to the water pump.
While the engine cold, a cooling liquid circulates only through the block of cylinders, its head and a heater. When the liquid heats up to certain temperature, the thermostat opens also a liquid passes on the top hose to a radiator. Passing through a radiator, the liquid is cooled by the stream of air formed at movement of the car. When it is necessary, this stream amplifies fan work.
On diesel models the cooling liquid passes through a cooler of impellent oil or an intermediate cooler of oil, and also around турбокомпрессора (where is available). On models with automatic transmission the cooling liquid is passed also through a cooler трансмиссионной liquids.
In process of engine heating the cooling liquid extends, and its part moves to a broad tank. After cooling of system the liquid comes back from a tank in a radiator.
The electrofan established behind a radiator, is started by a thermoswitch working at certain temperature of the cooling liquid.

Precautions

Do not uncover a bulk mouth of a broad tank and do not separate a part of system of cooling while the engine will not cool down as the probability of emission of hot steam and a liquid is thus great. If for any reason the cover nevertheless acts in film, accurately dump pressure in system. For this purpose capture a cover the thick fabric combined several times and slowly turn on it, yet will not hear a hissing sound. When hissing will stop (pressure is dumped), slowly turn away a cover and remove it; if hissing again is distributed, stop and wait, while it will not abate. Do not approach the person to a bulk mouth and protect hands gloves.
If antifreeze has got on your skin or on the painted surfaces of the car, immediately смойте the spilt drops a water considerable quantity. Never leave antifreeze in the open container or spilt on a garage floor - mortally poisonous liquid can involve children and pets with a pleasant smell.
Working on the models equipped with the conditioner of air, be guided by the Precautions resulted in Section Removal and installation of components of a heater (model Scenic).