Test Prerequisites

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NOTE:

Check cooling performance. The air conditioning system is functioning correctly when the air flowing from the instrument panel vents has a temperature of 7^o C or lower.

Setting on Climatronic "LO".

Setting on air conditioning system "AC" on; "max" ; "cold".

Connections with valve and service connections for measuring and checking.

Radiator and condenser are clean (clean if necessary)
Thermal insulation at expansion valve OK and properly installed. Refer to Removal and Installation .
Ribbed belt is OK and properly tensioned. Ribbed belt for A/C compressor and generator are OK and correctly tensioned. Refer to Removal and Installation .
All air ducts, covers and seals OK and properly installed
Fault finding on the electrical equipment and vacuum system found no malfunction. Refer to Diagnosis and Testing .

The A/C system OBD cannot find malfunctions with the Vehicle Diagnostic Tester in "Guided Fault Finding". The measured value block does not show any shut-off condition for the A/C compressor (only on vehicles with A/C system OBD).

Air flow through dust and pollen filter not obstructed by dirt. Refer to Removal and Installation .
The heater and A/C unit does not draw in any secondary air at the highest fresh air blower speed. Evaporator and heater not drawing in secondary air at maximum fresh-air blower speed. Refer to Description and Operation .
The air flaps in the heater and A/C unit reach their end position. Refer to Description and Operation .
Fresh-air intake ducts beneath hood and in passenger compartment as well as corresponding water drain valves OK. Refer to Diagnosis and Testing .
Engine is warm
Vehicle not exposed to direct sunlight
Ambient temperature greater than 15 °C (60 °F).
All instrument panel vents open
With engine running and maximum cooling output set on air conditioning system:

Refer to Description and Operation .

Set Maximum Cooling Output

Setting on A/C Display Control Head -E87-.

-- Preselect "Auto" mode (A/C compressor on).

-- Set temperature selection "LO" for driver's and passenger's side.

Setting on heater controls:

-- A/C button and Rec- or recirculated air button pressed.

-- Temperature dial in the "Cold" position.

-- Rotary fresh-air blower control in "4" position.

The Coolant Fan -V7- runs (the fans run) (at least in level 1).*

NOTE:

For some versions, fan is switched on only once the pressure in refrigerant circuit has exceeded a specified value.

The Fresh Air Blower -V2- runs at maximum speed.
Recirculated/fresh-air door set to "air recirculation mode" (within 1 minute after starting vehicle, air-flow door is closed and recirculated air door opened).*
Is the coolant shut-off valve closed? *
Are the valves on the pump valve unit closed and the coolant circulation pump is not pumping?