Checking heat output (and activation of temperature flaps) on vehicles fitted with an automatically controlled air conditioning system (without high-voltage system) — VW

🧭 Before you start

Fits: VW Golf VII Variant (BA), VW Golf VII (5G, 2012–2020)

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• Check with your hand if air is blown out of the activated vents.
• Only applies to LHD vehicles; on RHD vehicles G192 is fitted in the "“right footwell”" vent duct.

📋 Procedure

1. Close the doors, front lid, windows, sun roof and rear lid.
2. Open all dash panel vents.
3. Start engine. [Note: If in vehicles with a start/stop function the engine does not start or if it is switched off via the "“start/stop function”", start the engine, e.g. by setting the temperature on the operating unit, the J255 to "“LO”" and by activating the "“A/C”" function.]
4. Engine is running (or starts after the setting has been changed):
5. With the engine running, operate the air conditioning system for several minutes at maximum cooling output.

6. "“Read measured values”" of vent temperature senders G150/G151 and evaporator temperature sensor G308vehicle diagnostic tester in "“Guided fault finding”" mode.
7. Compare the measured values of the vent temperature senders G150/G151/G192 to the measured value of the evaporator temperature sensor G308. [Note: Check with your hand if air is blown out of the activated vents.]
8. Set the highest possible temperature for the driver side.
9. "“Read measured values”" for vent temperature senders G150/G151/G192. [Note: Only applies to LHD vehicles; on RHD vehicles G192 is fitted in the "“right footwell”" vent duct.] [Note: On vehicles with no V51, set the engine speed to roughly 2000 rpm and repeat the test if necessary. If the temperature of the air increases above 55 °C on repeating the test at increased engine speed, this is an indication that not enough coolant is flowing through the heat exchanger for heater. Cause: inadequate engine coolant pump delivery at idle or heat exchanger for heater not incorporated into the coolant circuit in the specified manner 19Cooling system, coolant; Coolant hose schematic diagram, vehicles with high-voltage system (coolant hose schematic diagram).The required heat output is not attained if insufficient heated coolant flows through the heat exchanger for heater.]
10. Set the highest possible temperature for the front passenger side.
11. "“Read measured values”" for vent temperature senders G150/G151/G192.
12. Set the lowest possible temperature for the driver's and front passenger's side.
13. "“Read measured values”" for the vent temperature senders G150/G151/G192 and evaporator temperature sensor G308.
14. Compare the measured values of the vent temperature senders G150/G151/G192 to the measured value of the evaporator temperature sensor G308.

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