| Prerequisites for checking cooling output of air conditioner |
| Vehicles with a high-voltage system only (hybrid vehicles with electrically driven air conditioner compressor), not for vehicles with mechanically driven air conditioner compressor |
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| Ambient temperature above 15 ° C. |
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| Radiator and condenser clean; clean if necessary |
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| All air ducts, covers and seals OK and properly installed. |
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| Air flow through dust and pollen filter not impeded by contamination → Chapter. |
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| Air intake (in fresh-air and air recirculation mode) not impeded by contamination or retrofitted components |
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| Vehicle not exposed to sunlight. |
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| Engine warm (coolant temperature above 80 °C) |
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| All dash panel vents open. |
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| Ignition switched on and READY activated, engine only running if e.g. drive battery -A2- not sufficiently charged |
DANGER! | Danger from unexpected engine starting and risk of poisoning in enclosed areas when working with the ignition switched on or with READY activated. Risk of parts of the body and/or clothing becoming trapped or caught up. |
| Take the following action before switching on the ignition: |
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| Move the selector lever to position P |
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| Activate the parking brake |
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| Switch off the ignition |
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| Connect a charger, e.g. Battery charger -VAS 5095A- to the jump start points of the 12 V vehicle electrical system |
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| READY is displayed in the control unit in dash panel insert -J285- via the „Powermeter“. |
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| Activate READY (and heed the display in the control unit in dash panel insert -J285-) → Owner's manual. |
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| The selector lever is to be set to position „P“ and the parking brake activated for checking and measurement work where the ignition has to be switched on but READY does not have to be active. |
| Following settings made on air conditioner operating and display unit, Climatronic control unit -J255- of „Basic“ type: |
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| „Auto“ mode (lamp in AUTO button lights). |
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| „Cold“ temperature setting (display „LO“ on Multi Media Interface display) |
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| Air conditioner compressor switched on (lamp in AC button lights). |
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| „Maximum speed“ pre-selected for fresh air blower (speed „10“ or higher indicated in Multi Media Interface display). |
| Following settings made on air conditioner operating and display unit, Climatronic control unit -J255- of „Deluxe“ type: |
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| „Auto“ mode (lamp in both AUTO buttons lights) |
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| „Cold“ temperature setting for driver and front passenger side (display „LO“ for driver and front passenger side on display of air conditioner operating and display unit and Multi Media Interface) |
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| Air conditioner compressor switched on (lamp in AC button lights). |
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| „Maximum speed“ pre-selected for fresh air blower (speed „10“ or higher indicated on display of air conditioner operating and display unit and Multi Media Interface) |
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| Lamp in AUTO button(s) goes out when the fresh air blower speed is altered manually. |
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| The maximum possible fresh air blower speed depends on various ambient influences (coolant temperature, vehicle electrical system voltage etc.). |
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| On vehicles with an air conditioner of the „Deluxe“ type, the potentiometer for rear temperature selection -G538- is set to „Cold“ (fitted in vent of rear centre console). |
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| On vehicles with an air conditioner of the „Deluxe“ type, the vent in the rear centre console is open. |
| Functions with READY active: |
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| Operation of radiator fan(s) (radiator fan -V7- and radiator fan 2 -V177-) (actuation and speed are governed by pressure in refrigerant circuit and engine temperature). |
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| Operation of fresh air blower -V2- at maximum speed (speed „10“ or higher) |
Note | The maximum possible fresh air blower speed depends on various ambient influences (coolant temperature, vehicle electrical system voltage etc.). |
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| Switching of the air conditioner to air recirculation mode (approx. 1 minute after starting the engine / activating READY, the air flow/fresh-air flap is closed and the air recirculation flap opened, air is drawn in by the fresh air blower -V2- from the passenger compartment beneath the dash panel/behind the glove compartment). |
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