Pic. 10.1. The heating and ventilation system with climate control system in the E-class models is equipped with two filters (1) with activated carbon and one filter (2) purification of the air entering the cabin. The carbon filter housings are located behind the fan, the dust filter is located in front of the fan. Thanks to this, in the recirculation mode, the air is also cleaned
The car is equipped as standard with an electronically controlled automatic heating system and a filter for cleaning the air entering the passenger compartment, with separate adjustment for the driver and front passenger, traditional for Mercedes cars. Air conditioning or climate control system can be installed as additional equipment (pic. 10.1).
On E-class models with six- and eight-cylinder engines, as well as on all cars with air conditioning, an additional electric pump is installed to improve fluid circulation in the heating system.
The inflow of fresh air into the heating system occurs through the inlet under the windshield. Air passes through the heater body and is distributed by a system of various dampers through separate air ducts to the ventilation deflectors. When the heater is installed for heating, the system dampers in the engine compartment open access to the heater radiator. The radiator is located in the heater housing and is heated by the hot engine coolant. The supply air, passing through the hot radiator fins, is heated and then fed into the passenger compartment.
Control and adjustment device located in the center of the instrument panel and consists of two rotary temperature controls and an electronic temperature setting system. Set temperatures (setpoints) are compared by temperature sensors with current values (actual). Depending on this, a double valve is controlled. The opening period is related to the difference between set and actual temperatures.
circulation valve (double valve) located in the mounting block on the right side of the engine compartment. The double valve consists of two interdependent solenoid valves installed in a single block. Each valve is installed in the coolant circulation system and allows it to enter through the corresponding heat exchanger. So, for example, if full power is needed for heating, the valve is constantly open. On the contrary, when the heating is off, the valves are closed. When the temperature is controlled automatically, with the ignition on, you can often hear the operation of the valve. Through an electrical contact, voltage is applied to both solenoid valve coils. The magnetic armature moves down under the action of the magnetic field, and the valve seat blocks the flow of coolant. When no voltage is applied, the valve is open.
circulation pump installed under the air filter on the right side of the engine compartment. With the ignition on and the heating system running, the pump pumps coolant through the heat exchanger. In doing so, it supports the main coolant pump. After the engine has stopped, the circulation pump continues to circulate the coolant on its own. Thus, heating can occur until all the heat from the engine is used up. The pump connection circuit is protected by fuse No. 3. Connection to «mass» is carried out through an automatic control and adjustment device for the heating system.