Volkswagen Polo Service & Repair Manual: Test Requirements

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / Pressures, Checking / Refrigerant Circuit Pressures (with A/C Service Station), Checking / Test Requirements

Note

Check cooling performance. The A/C system is functioning correctly when the air flowing from the instrument panel vents has a temperature of 7⁰C or lower.

Setting on Climatronic “LO”.

Setting on A/C 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 → Rep. Gr.87 for the vehicle-specific repair manual.

Ribbed belt is OK and properly tensioned. Ribbed belt for A/C compressor and generator are OK and correctly tensioned. Refer to → Rep. Gr.87 for the vehicle-specific repair manual.

All air ducts, covers and seals OK and properly installed.

Fault finding on the electrical equipment and vacuum system found no malfunction. Refer to → Rep. Gr.87 for the vehicle-specific repair manual.

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 from 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 → Rep. Gr.87 for the vehicle-specific repair manual.

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 → Rep. Gr.87 for the vehicle-specific repair manual.

The air flaps in the heater and A/C unit reach their end position. Refer to → Rep. Gr.87 for the vehicle-specific repair manual.

Fresh-air intake ducts beneath hood and in passenger compartment as well as corresponding water drain valves OK, see vehicle specific Repair Manual. Refer to → Rep. Gr.87.

The engine is warm.

Vehicle is not exposed to direct sunlight.

Ambient temperature greater than 15 °C (60 °F).

All instrument panel vents are open.

With engine running and maximum cooling output set on air conditioning system:

Refer to → Rep. Gr.87.

Maximum cooling output, setting

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

–	Preselect “Auto” mode (A/C compressor on).

–	Set the temperature preset “LO” for the driver and front passenger sides.

Setting on heater controls:

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

–	Temperature dial in the “Cold” position.

–	Fresh-air blower dial in “4” position.

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

Note

For some versions, the 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 min. 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? *

Refrigerant Circuit Pressures (with A/C Service Station), Checking

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Pressures, Checking

Note Check cooling performance. The A/C system is functioning correctly when the air flowing from the instrument panel vents has a temperature of ...

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