Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Right Side A/C System Control And Regulation Components
- A/C Unit
- Different versions (with a version of the Climatronic Control Module -J255- A./C control head, Basic and Comfort versions vehicles with left or right-hand steering, vehicles with or without the auxiliary air heater heating element -Z35-) .
- Heating and A/C unit components, refer to A/C COMPONENTS .
- Air guide in air conditioner and in vehicle, refer to AIR DISTRIBUTION IN A/C AND AIR INTAKE UNITS, BLOCK DIAGRAM .
- Heating and A/C unit, removal and installation, refer to A/C UNIT .
- Dust and Pollen Filter
- Follow the replacement intervals.
- Different versions depending on vehicle equipment and production time frame. Refer to the Electronic Parts information (ETKA).
-- On vehicles with the Climatronic Control Module -J255- A/C control head Basic version without activated charcoal filter element
-- On vehicles with the Climatronic Control Module -J255- A/C control head Comfort version with activated charcoal filter element. There is also an air quality sensor -G238- installed on these vehicles.
- In model year 2008, vehicles with a Comfort A/C system will have a modified dust and pollen filter with an activated charcoal filter element installed as a running change. This filter with an improved interception rate for fine particulates has approximately the same air resistance values as the filter installed prior to the change, and for this reason will be installed in vehicles built up to the change.
- Removal and installation, refer to DUST AND POLLEN FILTER .NOTE:
Depending on the version, for some countries with high dust levels, a dust filter is installed at the air intake unit instead of intake air grille, which prevents dust and sand from entering the fresh air blower; replace this if necessary together with the dust and pollen filter. Refer to FRESH AIR INTAKE GRILLE .
- Evaporator
- May only be removed when refrigerant circuit has been removed; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to EVAPORATOR .
- Removal and installation, refer to EVAPORATOR .
- Clean air conditioning system evaporator with ultrasonic HVAC cleaning systemVAS 6189. Refer to A/C SYSTEM EVAPORATOR, CLEANING WITH VAS 6189 .
- Heater Unit Heat Exchanger
- Removal and installation, refer to A/C UNIT HEAT EXCHANGER .
- Auxiliary Heater Heating Element -Z35-
- Not for North American market.
- Condensate Drain Hose
- Right (front passenger side).
- Checking, removal and installation, refer to CONDENSATION DRAIN HOSE .
- One condensate drain hose each for driver and front passenger side.
- Right Instrument Panel Vent
- Instrument panel vents, removal and installation. Refer to INSTRUMENT PANEL .
- Driver Door Vent
- Right Front Seat Temperature Sensor -G345- and Right Front Heated Seat -Z46-
- Seat heater (and seat ventilation) is not installed on all vehicles (optional equipment, introduction of seat ventilation is not yet finalized).
- Activation of seat heater is displayed in measured value block of A/C control head Climatronic Control Module -J255-, check using the Vehicle Diagnostic, Testing and Information SystemVAS 5051.
- Servicing seat heater and seat ventilation. Refer to BENCH SEAT COVER AND UPHOLSTERY .
- In vehicles with seat occupied sensor system, the seat heaters for front passenger seat and rear seats may be switched off after approximately 10 minutes, without an indicating display in this measured value block, if the airbag control module -J234- detects the seat is unoccupied (read measured value block of the airbag control module -J234- using the Vehicle Diagnostic, Testing and Information SystemVAS 5051).
- Multi Media Interface (MMI) Terminal
- Different versions and operation; depends on the version of the MMI (Infotainment or Basic) and vehicle equipment. Refer to Owner's Manual and Infotainment/MMI Owner's Manual.
- Various auxiliary A/C system functions can be selected and their settings modified via the Setup button on the Climatronic Control Module -J255- A/C control head at the MMI terminal (different versions). Refer to Owner's Manual and Infotainment/MMI Owner's Manual.
- The functions selected on the Climatronic Control Module -J255- A/C control head and various other A/C system functions are shown on the MMI display. Refer to Owner's Manual and Infotainment/MMI Owner's Manual.
- To enable the selected A/C system functions to be displayed at the MMI display, the correct versions of the Climatronic Control Module -J255- A/C control head and MMI control module have to be installed. Refer to item 11 LEFT SIDE A/C SYSTEM CONTROL AND REGULATION COMPONENTS => List Item:A/C control head Climatronic Control Module -J255- of Comfort A/C system.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.