Mercedes S-class W202

1993-2000 of release

Repair and car operation

5.5. Check of system of cooling

THE GENERAL DATA

By means of the standard control device it is possible to check up негерметичность systems of cooling and safety valve functioning in a carving cover of system of cooling.

PERFORMANCE ORDER

Spread the control device on a bulk branch pipe of a compensatory tank. The manual pump of the device create superfluous pressure nearby 1,4 bar. If pressure falls, find not tight place, the cooling liquid whence follows, and eliminate a thinness. If pressure falls without signs вытекания a cooling liquid or even raises, it is possible to assume loss of a cooling liquid in the engine, for example, because of damage of a lining of a head of the block of cylinders or a crack in the case.

SAFETY VALVE OF SUPERFLUOUS PRESSURE

The safety valve is established in a radiator cover. Its problem – since certain superfluous pressure to open cooling system and by that to create running off conditions in a compensatory tank of superfluous quantity of a cooling liquid.

PERFORMANCE ORDER

Screw on the control device (1) carving cover of a radiator (2). Create superfluous pressure. The safety valve should open at pressure within 1,3–1,4 bar. Otherwise replace a cover.

THE VACUUM VALVE

PERFORMANCE ORDER

1. Extend fingers the vacuum valve so that it has opened. Check up, whether the valve is completely closed at отпускании. The vacuum valve in a cover opens at 0,1 bars of the lowered pressure. 2. Screw a cover on a radiator. At damage replace a rubber sealing ring.

THE GAUGE OF INDICATION OF THE COOLING LIQUID (THE DIESEL ENGINE)

The system of indication of level of a cooling liquid basically consists of the gauge in a compensatory tank and a control bulb on the panel of devices.

Indication of level of a cooling liquid at the working engine warns about too low level of a cooling liquid and, thanks to it, about a possible overheat of the engine. As soon as ignition joins, the control bulb is shone within 30 seconds. At the working engine this bulb dies away at once.

Level of a cooling liquid in a compensatory tank acts in film by means of a float (551). At low level of a cooling liquid in the gauge contact (550) becomes isolated and the control bulb lights up. Depending on a movement mode a control bulb at first it is short-term, and after constantly flashes. If the control bulb flashes, add a cooling liquid.

Check

PERFORMANCE ORDER

1. Start the engine and leave it to work in an idling mode. 2. Extend штеккер on the gauge of level of a cooling liquid. 3. Connect an ohmmeter between both contacts on the gauge. At level of a cooling liquid on a mark "max" the measuring device should show infinity. At an empty compensatory tank resistance should make nearby 5 Ohm. 4. Stop the engine. 5. If the gauge is perfectly in order, though the control bulb is not shone, check up according to the basic electroscheme electric lines and a control lamp.

Removal

PERFORMANCE ORDER

1. If it is required, merge a little a cooling liquid. 2. Raise a screw-driver a safety ring (550а). 3. Extend the gauge from a compensatory tank.

Installation

PERFORMANCE ORDER

1. Insert the new gauge with a new sealing ring (552) so that various ledges on width on the gauge were fixed in an aperture of a compensatory tank. 2. Press a safety ring. 3. Fill in cooling liquid.