| Test requirements before the pressure test |
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| The radiator and condenser are clean (if necessary clean). |
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| The heat-protection insulation on the expansion valve is O.K. and is correctly mounted. See vehicle-specific workshop manual → Rep. gr.87. |
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| The V-ribbed belts for AC compressor and AC generator are O.K. and are correctly tensioned. |
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| All the air guides, covers and seals are O.K and are correctly mounted. |
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| The self-diagnosis of the air conditioning system (e.g. with the → Vehicle diagnostic tester) does not detect any fault, no switch-off condition of the AC compressor is displayed in the measured value block (only for vehicles with air conditioning system self-diagnosis). |
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| The air flow rate through the dust and pollen filter is not impaired by contamination. See vehicle-specific workshop manual → Rep. gr.87. |
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| The air conditioning unit does not draw any secondary air at the highest fresh air blower speed. |
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| The air guide flaps in the air conditioning unit, in the heating and in the evaporator reach their final setting. See vehicle-specific workshop manual → Rep. gr.87. |
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| The fresh air intake ducts under the front flap and in the passenger compartment as well as the related water drain valves are O.K. see vehicle-specific workshop manual → Rep. gr.87. |
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| Engine is at operating temperature. |
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| The vehicle is not exposed to the sun's rays. |
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| The ambient temperature is higher than 15°C. |
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| All the dash panel vents are opened. |
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| While the engine is running and with the air conditioning system set to maximum cooling capacity: |
| Setting on the control and display unit for air conditioner Climatronic -E87-: |
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| Pre-select operating mode „auto“ (AC compressor switched on). |
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| Set temperature pre-selection „LO“ for driver and passenger side. |
| Setting on the manual heater control, air conditioner Climatic: |
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| „AC“ and re-circulating button pressed. |
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| Temperature rotary switch is positioned on stop „cold“. |
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| Rotary switch for fresh air blower -V2- on position „4“. |
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| If the radiator fan (if the fans run) runs -V7- (min. in stage 1). |
Note | On certain versions, the fan is only switched on after the pressure in the refrigerant circuit has exceeded a given value. |
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| The AC compressor is indeed driven (air conditioner magnetic coupling -N25- is closed, it is possible that the existing belt protection in the AC compressor belt pulley is not damaged). |
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