A/C Cooling Output, Testing Requirements

• The ambient temperature is greater than 15 °C (59 °F).
• Radiator and condenser are clean (if necessary, clean).
• If a vehicle has electric radiator shutters, their function is OK.
• The A/C compressor ribbed belt, is OK and is tensioned correctly. The belt pulley is actually driving the A/C compressor. Refer to OVERVIEW - BELT PULLEY .
• All air ducts, covers and seals are OK and properly installed.
• Airflow through the dust and pollen filter is not obstructed by debris. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .
• The air intake (in fresh air and recirculating air mode) is not impaired by debris or retrofitted components.
• If equipped the air duct for glove compartment cooling is installed in the glove compartment as specified. Refer to AIR GUIDE FOR GLOVE COMPARTMENT COOLING, REMOVING AND INSTALLING .
• The vehicle is not exposed to sunlight.
• The engine is warm (the coolant temperature is higher than 80 °C (176 °F)).
• The DTC memory of the Front A/C Display Control Head -E87- is called up and erased, the basic setting is performed and the coding of the Front A/C Display Control Head -E87- is checked using the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.
• The adaptation for the Front A/C Display Control Head -E87- was checked. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.
• The following is set in the MMI (Multi Media Interface) via the "A/C" function in the "Car" / "Vehicle" menu for the regulation of the A/C system: automatic recirculation "off" and "medium" footwell temperature (arrow pointing upward).

• All instrument panel vents and the vents in the rear center console (if equipped) are open.
• The vent for glove compartment cooling (in the glove compartment) is closed.
• Ensure that the air outlet from the rear footwell vents (under the front seat) is not blocked by floor mats or other objects.
• The hood is closed.
• The engine is running.

On The Front A/C Display Control Head -E87- -A And B- The Following Is Adjusted: 

• If equipped set the SYNC  function on the Front A/C Display Control Head -E87-.
• Select "Auto" mode (for the driver side and the front passenger side) (the indicator lamp in the AUTO  button(s) turns on).
• "Cold" temperature preset (16 °C (60.8 °F) for the "Low" A/C system).
• "Cold" temperature preset for the driver and front passenger side ("LO" display for the driver and front passenger side for the "High" A/C system and the MMI).
• The A/C compressor is on (the indicator lamp in the A/C MAX  button turns on).
• Preset for the fresh air blower "maximum speed".
• Adjust the airflow direction of the air via the knob on the Front A/C Display Control Head -E87- to "footwell" and "instrument panel vent" (on the "Low" A/C system).
• Set the airflow direction on the driver and front passenger side to "footwell" and "instrument panel vent" (for the "High" A/C system) using the knob or buttons on the Front A/C Display Control Head -E87- (shown in the display or the buttons for the Front A/C Display Control Head -E87-).

For a "High" A/C system, the following is set on the Rear A/C Display Control Head -E265- -A- :

• "Cold" temperature setting ("LO").

Functions With Engine Running: 

-- The radiator fan(s) (Radiator Fan -V7- and Radiator Fan 2 -V177-) run (activation and speed depend on refrigerant circuit pressure and engine temperature).

-- The Fresh Air Blower -V2- runs at maximum speed.

-- The A/C system goes in recirculating air mode (approximately one minute after starting the engine, the back pressure/fresh air door is closed and the air recirculation door is opened. The Fresh Air Blower -V2- extracts the air from passenger compartment below instrument panel/behind the glove compartment).