Automatic heater and air conditioner, ventilation, independent heater (Mercedes-Benz C-Class W203)

Automated heating system (Heizmatic)

Control Panel

The set temperature is reached in the heating mode as quickly as possible and is maintained constant. The temperature can be set for each side separately.

Change the set temperature only in small steps.

Models with engine residual heat utilisation function:

When using the "Engine residual heat mode" function, the vehicle interior can also be heated when the engine is switched off.

As a basic setting for regulating the interior temperature, we recommend setting the temperature controls to 22°C.

General notes on the automated heating system

The dust filter completely retains pollen and dust particles up to a certain size.

If the interior is heated by the sun, you should quickly ventilate it before starting to drive.

Note: Do not block the air vents in the space between the rear seatback and the rear window.

Keep the air intake slits on the hood free of snow.

Manual air distribution control

Air distribution is regulated simultaneously for the left and right sides.

Air outlet at the top from the middle and side deflectors, as well as from the deflectors on the instrument panel.

Air outlet from windshield deflectors and side window defrost deflectors.

Air outlet from the footwell vents, the middle and side vents and the rear footwell vents.

Basic position of controls in heating mode (winter)

Set temperature regulators (2 and 3) as desired.

Set the air supply regulator as desired, but not lower than position 2, otherwise the windows may fog up.

Install the air distribution regulator (4) as shown in the illustration above.

To reduce the temperature in the ceiling space, open the cold air mixing adjustment wheel as desired.

Open the middle and side deflectors as desired.

Basic position of controls in ventilation mode (summer)

Set temperature regulators (2 and 3) as desired.

Set the air supply regulator (1) as desired, but not lower than position 1.

Turn the air distribution regulator (4) to .

Open the middle deflectors.

Open the side deflectors.

To distribute air evenly, open the ventilation deflector on the top of the instrument panel.

This installation ensures good ventilation of the passenger compartment.

Special provisions - choose for short periods only

Switching the automated heating system on and off

Turn the air supply rotary switch to 0.

To turn on the automated heating system, turn the rotary air supply switch to the desired fan position.

Defrosting glass

Click the button . The control LED on the button lights up.

If necessary, turn off the air circulation mode . The control LED on the button goes out.

Fogging of glass from the inside

If necessary, turn off the air circulation mode (6) The control LED on the button goes out.

Turn the air distribution regulator (4) to the position .

Set the air supply regulator (1) to a higher fan setting.



Set the temperature controls (2 and 3) to a higher temperature.

Fogging of the windshield from the outside

Turn on the windshield wiper.

Close the ventilation deflector on the top of the instrument panel.

Turn the air distribution regulator to the position or .

Penetration of unpleasant odors from outside into the interior

Only turn on the air circulation mode for short periods of time, otherwise the windows may fog up.

Turn on the air circulation mode: press the button . The control LED on the button lights up.

The air circulation mode automatically turns off after approximately 5 minutes.

Engine residual heat utilization mode

When the engine is switched off, the interior heating is possible for some time. The duration of heating depends on the set temperature.



Set both temperature controls as desired.

Set the air distribution through the ventilation deflectors as desired.

Note: Regardless of the position of the air supply regulator, the fan operates at low speed.

Before switching on: turn the ignition switch key to position 1 or 0 or remove it.

Enabling the engine residual heat use mode

Click on the button . The control LED on the button lights up.

Switching on is not possible if the battery is not sufficiently charged.

Disabling the engine residual heat mode

Click on the button .

The control LED does not go out.

Automatic shutdown is performed:

• if the key in the ignition switch turns to position 2,
• in about 30 minutes,
• if the battery voltage drops.

Automated air conditioner (Thermatic)

The location of the controls and deflectors is shown in the illustration at the beginning of the Section.

Air deflectors in the rear of the cabin

Note: The temperature of the air coming out of the center vents in the rear of the cabin corresponds to the temperature of the air coming out of the center vents near the instrument panel.

Control Panel

The automated air conditioner is operational only when the engine is running. If the economy mode is selected , the cooling system does not work.

In automatic mode, the automated air conditioner cools or heats depending on the outside temperature and the desired temperature in the car. When the automatic mode function is switched off, the air supply and distribution can also be adjusted manually.

When using the "Engine residual heat mode" function, the vehicle interior can also be heated when the engine is switched off.

The temperature can be set for each side separately. Change the set temperature only in small steps.

General notes on automated air conditioning

The dust filter completely retains pollen and dust particles up to a certain size.

If the interior is heated by the sun, you should quickly ventilate it before starting to drive.

The storage compartment between the front seats can be air-conditioned in the compartment on the centre console under the armrest console - see later in this Section).

Note: Do not block the air vents in the space between the rear seatback and the rear window.

Keep the air intake slits on the hood free of snow.

Condensation may form on the underside of the vehicle.

When refrigerant leaks, the air conditioner compressor automatically switches off to protect against damage.

The cooling system no longer works. Economy mode cannot be switched off. In this case, contact one of the service stations "Mercedes-Benz" to test the automated air conditioner.

Basic position of controls in automatic mode

Click on the button . Air supply and distribution are regulated automatically.

Set the temperature controls to 22°C as the basic setting for regulating the interior temperature. Change the set temperature in small steps.

Heating mode

To reduce the temperature in the ceiling space, open the cold air mixing adjustment wheel as desired.

Cooling mode

To distribute air evenly, open the ventilation deflector on the top of the instrument panel.

Special provisions - select for short periods only.

Turning the automated air conditioner on and off

Turn the air supply rotary switch to 0. The automated air conditioner is turned off.

To turn on the automated air conditioner, turn the rotary air supply switch to the desired fan position.

Manual regulation of air supply and distribution

Click on the button . The control LED on the button goes out.

6 fan stages and air distribution can be selected manually.

Return to automatic mode:

Click on the button . The control LED on the button lights up.

Manual air distribution control:

Air distribution is regulated simultaneously for the left and right sides.

Air outlet at the top from the middle and side deflectors, as well as from the deflectors on the instrument panel.

Air outlet from windshield deflectors and side window defrost deflectors.

Air outlet from the footwell vents, the middle and side vents and the rear footwell vents.

Defrosting glass

Fogging of glass from the inside

Click on the button . The control LED on the button lights up.

Turn off the air circulation mode . The control LED on the button goes out.

Fogging of the windshield from the outside

Turn on the windshield wiper.

Close the ventilation deflector on the top of the instrument panel.

Manual mode: turn the air distribution control to position or .

Air circulation mode

Turn on air circulation mode:

Control LED on the button does not burn.

Press the button lightly . The control LED on the button lights up.

Turning off the air circulation mode:

Control LED on the button is on. Press the button lightly . The control LED on the button goes out.

Switching on the air circulation mode and activating the comfort closing:

Control LED on the button does not light. Button press and hold for more than 2 seconds, the side windows will rise. The control LED on the button will light up.

Turning off the air circulation mode and activating the comfort opening:

Control LED on the button is on. Button press and hold for more than 2 seconds, the side windows will return to the position they were in before closing.

If, after comfort closing, one of the windows was manually lowered or the glass roof panel was opened, then during comfort opening it does not return to the position it was in before closing.

Switching from the air circulation mode to the outside air supply mode is performed automatically:

• after 30 minutes at an outside air temperature above approximately 5°C,
• after 5 minutes at an outside air temperature below approximately 5°C,
• after 5 minutes if economy mode was selected .

At high outside temperatures, the unit automatically switches to air circulation mode. After approximately 30 minutes, outside air begins to be mixed in.

Economy mode

Enabling Economy Mode:

Click the button .

The control LED on the button lights up.

The cooling system does not work and air dehumidification does not occur.

Note: Pressing the button again will reactivate the previously selected mode.

Engine residual heat utilization mode

When the engine is switched off, the interior heating is possible for some time. The duration of heating depends on the set temperature.

Set both temperature controls as desired.

Set the air distribution through the ventilation deflectors as desired.

Note: Regardless of the position of the air supply regulator, the fan operates at low speed.

Before switching on: turn the ignition switch key to position 1 or 0 or remove it.

Activating the engine residual heat mode: press the button . The control LED on the button lights up.

Switching on is not possible if the battery is not sufficiently charged.

Disabling the engine residual heat mode:

Click on the button .

The control LED on the button goes out.

Automatic shutdown is performed:

• if the key in the ignition switch turns to position 2,
• in about 30 minutes,
• if the battery voltage drops.

Automated air conditioner with comfortable control (Thermotronic)

The layout of the controls and deflectors is shown in the illustration at the beginning of this section. The deflectors in the rear of the cabin are located similarly to the Thermatic models (see above).

Display and keyboard

Display indication

The automated air conditioner with comfort control is only in a state of readiness when the engine is running.

In economy mode , no cooling occurs.

In automatic mode, the automatic air conditioner cools or heats depending on the intensity of the sun, the outside temperature and the desired temperature in the car. When using the "Engine residual heat mode" function, the car's interior can also be heated or ventilated when the engine is off.

The set temperature should only be changed in small steps. The automatic air conditioner can be set for the left and right sides separately.

The set temperature is reached as quickly as possible and maintained constant.

General recommendations for automatic air conditioner

Please refer to the relevant subsection relating to the Thermatic HF above in this Section.

The main position of the controls is in automatic mode

Press both handles . Symbols , and are no longer illuminated.

The EC economy mode and air circulation mode functions are switched off. At the same time, the automatic fan mode is activated.

As a basic setting for regulating the interior temperature, we recommend setting the temperature display on the display to 22°C. The set temperature should only be changed in small steps.

Heating mode

To reduce the temperature in the ceiling space, open the cold air mixing adjustment wheel as desired.

Cooling mode

To distribute air evenly, open the ventilation deflector on the top of the instrument panel.

Special provisions - select for short periods only.

Switching on and off the automated air conditioner with comfort control

Left air supply key switch press until the display indicator goes out.

To turn on the automated air conditioner with comfort control, the key switch for air supply click on the right.

Manual air supply control

7 fan stages can be selected.

Right air supply key switch or press the button on the left repeatedly until the desired fan level is set. The fan levels are indicated on the display.

The "AUTO" indication on the display goes out and the automatic fan mode is switched off.

To turn on the automatic fan mode, press the left or right handle air distribution.

Manual air distribution control

Press the handle . The handle extends, symbols are visible , and . Turn the handle according to the required air distribution.

Air outlet from the center and side deflectors, door deflectors and windshield deflectors.

Air outlet from the middle and side deflectors, door deflectors and windshield.

Air outlet from the middle and side deflectors, door deflectors and footwell.

Return to automatic mode: Press and lock the handle . Symbols , and are no longer visible.

Defrosting glass

Fogging of glass from the inside

Click the button . The control LED on the button lights up.

If necessary, turn off the air circulation mode . The control LED on the button goes out.

Fogging of the windshield from the outside

Turn on the windshield wiper.

Close the ventilation deflector on the top of the instrument panel.

Manual mode: Turn the air distribution regulator to the position or .

Air circulation mode

Turn on the air circulation mode: Control LED on the button does not burn.

Press the button briefly . The control LED on the button lights up.

Switching off the air circulation mode: The control LED on the button lights up .

Press the button briefly . The control LED on the button goes out.

Switching on the air circulation mode and activating the comfort closing:

The control LED on the button does not light.

Button press and hold for more than 2 seconds, the side windows and the sliding and lifting sunroof are closed. The control LED on the button lights up.

Turning off the air circulation mode and activating the comfort opening:

On the button the control LED is on. The button press for more than 2 seconds, the side windows and the sliding and lifting sunroof move to the position they were in before closing.

If, after comfort closing, a window was manually lowered or the sliding and lifting sunroof was opened, then comfort opening does not return to the position they were in before closing.

Switching from the air circulation mode to the outside air supply mode is performed automatically:

• after 30 minutes at an outside air temperature above approximately 5°C,
• after 5 minutes at an outside air temperature below approximately 5°C,
• after 5 minutes if economy mode was selected .

At high outside temperatures, the unit automatically switches to air circulation mode. After approximately 30 minutes, outside air begins to be mixed in.

Turning on economy mode

Click on the button .

The control LED on the button lights up.

The cooling system does not work and air dehumidification does not occur.

Note: Pressing the button again will reactivate the previously selected mode.

Activated carbon filter and automatic air circulation that take into account outdoor air pollution

The filter significantly reduces the concentration of harmful substances and significantly retains odors.

Automatic switching to air circulation mode occurs if the concentration of carbon monoxide (CO) or nitrogen oxide (NOx) in the outside air increases.

Automatic air circulation mode is not possible when economy mode is selected or the outside air temperature is below 5°C.

Switching on the carbon air filter and air circulation, taking into account the pollution of the outside air by exhaust gases:

Control LED on the button does not light. Press the button briefly . The control LED on the button lights up.

Switching off the air circulation carbon filter, taking into account the pollution of the outside air by exhaust gases:

The control LED on the button lights up .

Press the button briefly . The control LED on the button goes out.

Switching on the carbon filter and automatic air circulation and activating the comfort closing:

Control LED on the button does not light. Button press for more than 2 seconds, the side windows and the sliding and lifting sunroof are closed. The control LED on the button lights up.

Switching off the carbon filter and activating the comfort opening:

On the button the control LED is on. The button press for more than 2 seconds, the side windows and the sliding and lifting sunroof move to the position they were in before closing.

If, after comfort closing, a window was manually lowered or the sliding and lifting sunroof was opened, then during comfort opening the position they were in before closing is no longer reached.

Engine residual heat utilization mode

Please refer to the relevant subsection relating to the Thermatic HF above in this Section.

Air conditioning compartment in the center console under the armrest

(models with automated air conditioning)



There is a ventilation deflector in the compartment.

Opening: Slide the handle (1) upwards.

Closing: slide the handle (1) down.

Air supply depends on:

• from the established air distribution,
• from the installed air supply,
• from the opening position of the ventilation deflectors on the instrument panel.

The air temperature is approximately the same as the air coming out of the middle deflectors. It cannot be set separately.

Note: Extremely high temperatures may occur in the compartment due to the limited space. Therefore, when transporting heat-sensitive cargo, it is necessary to close the ventilation deflector of the switched-on heating.

Do not cover the ventilation deflector in the compartment with objects.

Independent heater

An independent heater heats or ventilates the vehicle interior depending on the value set on the automatic air conditioner and the air temperature in the interior.

All functions of the independent heater can be called up by the remote control. The independent heater can be switched on immediately (instant heating) or program it so that it turns on automatically at the required time (software heating).

The switch on the centre console can be used to switch the independent heater on and off and reset the activated on time.

The independent heater only switches on when the coolant temperature is below 70°C.

Note: Under appropriate temperature and weather conditions, it may happen that the system first produces ventilation and then heating, for example. This ensures that the required temperature can be reached as quickly as possible.

To achieve the maximum range of the remote control, it is recommended to fully extend the antenna during transmission and hold the remote control vertically. Transmission continues as long as the display indicator flashes.

The maximum range of the remote control is 1000 m. In closed rooms or due to massive obstacles, the range may be limited.

The operating time of the independent heater set at the factory is 50 minutes. However, it can also be set individually. Any service station will provide information on this issue "Mercedes-Benz".

The remote control for the independent heater can be stored in the storage compartment, in front of the selector lever, in a holder.

The car is equipped with a remote control device. Each car is provided with one additional remote control device of the same design. Information on this issue can be provided by any maintenance station "Mercedes-Benz".



The independent heater switch is located on the center console.

The left – red – LED displays the on state of the heater.

Right – yellow – displays the activation status of the heater switching time selection

Before switching on

Set the desired temperature for the cabin (see above in this Section). Recommended temperature left and right - 22°C.

The independent heater automatically sets the selected temperature.

Instant on

Switching on the independent heater using the switch

Press the switch to the symbol. The red control LED lights up.

Switching on an independent heater using a remote control device

Press the ON button on the remote control until the green control LED on the remote control lights up. On models with an automated air conditioner with comfort control, the display on the control panel is activated.

When the independent heater is switched on, the red control LED on the switch on the center console lights up.

Shutdown

The independent heater can be switched off using the remote control or the switch on the centre console.

Switching off using the switch: Press the switch on the center console to the symbol. The red control LED goes out.

Switching off with the remote control: Press the OFF button on the remote control until the red control LED lights up. The red control LED on the switch on the center console also goes out.

Activating the preset function

Three switch-on times can be set via the universal display of the independent heater, one of which can be activated as the switch-on time.

When the preset function is activated, the yellow LED on the switch lights up. When the independent heater is activated, the yellow LED on the switch goes out and the red LED on the switch lights up.

(Setting the switch-on time - see Section Multifunctional steering wheel, universal display).

(Calling the turn-on time - see Section Multifunctional steering wheel, universal display)

(Activation of the preset function is discussed in Section Multifunctional steering wheel, universal display).

Turning off the preset function

The preset function can be switched off using the switch (see above).

Note: After 50 minutes of heating/ventilation operation, the independent heater switches off automatically. The control LED goes out.

Replacing the batteries

Remove cover "1" downwards, passing the locking position.

Remove the old battery.

Insert the new battery "2" in accordance with the + and - pole markings molded onto the body of the remote control device.

Slide the lid on from below.