Engine cooling system Mercedes A-Class (W168)

Coolant circulation
The engine cooling system consists of the following main elements: radiator, coolant pump (water pump), thermostat and electric fan. Coolant circulation is controlled by...

Cooling liquid
At the factory, an aqueous solution of antifreeze is poured into the cooling system. Antifreeze is concentrated ethylene glycol with anti-corrosion additives that...

Coolant — replacement
If during the repair the cylinder head, cylinder head gasket, radiator, heater or engine were replaced, the coolant must in any case be replaced. This is necessary so...
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Thermostat — removal and installation
Removing The thermostat is built into the thermostat housing and can be replaced as a whole. Attention! With a hot engine, place a thick cloth over the filler cap before...

Thermostat — check
Attention! The illustrations show the thermostat removed from the housing. In A-class cars, the thermostat and housing form a single unit. The principle of operation of...

Checking the tightness of the cooling system
The tightness of the cooling system, as well as the performance of the outlet valve on the filler cap of the expansion tank, can be checked using a special device, for...

Water pump — removal and installation
Removing The water pump is located on the top side of the cylinder block and is driven by a ribbed belt. To remove it, it is necessary to lower the power unit down on...

Radiator blower fan — removal and installation
Removing 1. Disconnect the wire terminal from the negative pole of the battery «masses» (-), by turning off the ignition first. Attention! When the battery is...

Radiator — removal and installation
Removing 1. Drain the coolant from the radiator only ( see relevant chapter ). 2. Remove the front bumper ( see relevant chapter ). 3. Remove the radiator fan together...

Heater and air conditioner
Heating and ventilation of the cabin in A-class cars is carried out by air sucked in from the outside through the fairing grille. Outside air passes through the dust...

Interior air vents — removal and installation
Deflectors on the center console These deflectors are located on the center console. Removing them requires removing the console cover, see relevant chapter . Side...

Heater and air conditioner switches — removal and installation
Removing 1. Remove the center console cover, see relevant chapter . 2. Disconnect the plugs from the switches. 3. Wring out the locking tabs and remove the block 1 of...

Illumination lamp on the air conditioner temperature switch
Removing 1. Remove rotary switch 1 from the shaft by pulling it with sufficient force deep into the passenger compartment (see illustration). 2. Put a 5 mm insulating...

Heater fan motor — removal and installation
Removing 1. Remove the dust filter, see relevant chapter . 2. Remove the decorative frame of the heater / air conditioner unit by depressing the four locking tabs. 3....

Additional resistance of the interior blower fan
Attention! If the interior blower does not work in one of the speed modes, then, as a rule, the additional resistance is faulty. In this case, the additional resistance...