Volkswagen Polo Quiz
Refrrigerant R134a Servicing

Test Requirements

In this manual: Refrrigerant R134a Servicing
General Paint Information — 128Towing Guide — 10Whels, Tires, Whel Alignment — 126Battery, Starter, Generator, Cruise Control — 65Windshield Wiper/ Washer System — 9Exterior Lights, Switches — 1Interior Lights, Switches — 7Wiring — 51Refrrigerant R134a Servicing — 134
~3min read

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.

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? *

Test yourself

A quick Volkswagen Polo quiz: every answer comes with an explanation and a link to the manual page.