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. The circulation of the coolant is...

Coolant
At the manufacturer's plant, an aqueous solution of antifreeze is poured into the cooling system. Antifreeze is a concentrated ethylene glycol with anti-corrosion...

Coolant — Replacement
If the cylinder head, cylinder head gasket, radiator, heater or engine were replaced during the repair, the coolant must be replaced in any case. This is necessary so...
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Thermostat — removal and installation
Removal The thermostat is built into the thermostat housing and is replaced as a single unit. Caution! When the engine is hot, place a thick cloth on the radiator filler...

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

Checking the tightness of the cooling system
The tightness of the cooling system, as well as the functionality 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
Removal The water pump is located on the top side of the cylinder block and is driven by a V-belt. To remove it, you need to lower the power unit down on the front axle...

Radiator Blower Fan — Removal and Installation
Removal 1. Disconnect the ground (-) wire terminal from the negative battery terminal, after turning off the ignition. Warning! When you disconnect the battery from the...

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

Heater and air conditioner
Heating and ventilation of the passenger compartment in A-class cars is provided by air sucked in from outside through the fairing grille. Outside air passes through a...

Interior air deflectors — removal and installation
Center console deflectors These deflectors are located on the center console. To remove them, you need to remove the console cover, see the relevant chapter . Side...

Heater and Air Conditioner Switches — Removal and Installation
Removal 1. Remove the center console cover, see the relevant chapter . 2. Disconnect the plugs from the switches. 3. Press the locking tabs and remove the heater/air...

Light bulb on air conditioner temperature switch
Removal 1. Remove rotary switch 1 from the shaft by pulling it with sufficient force into the interior of the vehicle (see illustration). 2. Put a 5mm diameter...

Heater Fan Motor — Removal and Installation
Removal 1. Remove the dust filter, see the relevant chapter . 2. Remove the heater/air conditioner unit trim frame by pressing in on the four retaining tabs. 3. Unscrew...

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

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