Wat houdt deze storing in ?

[Kuupertie]

Heating / AC:
Air conditioning / Klimaanlage
Fehler: Short circuit to positive or open circuit - additional water pump / Refrigerant compressors
Code: 9C77

[Kuupertie]

The aux water pump is for heating the cabin after the engine is shut off. It circulates the still-hot coolant so that the heater core will stay hot and provide heat to the cabin. The aux water pump is to ensure that under all engine RPM the same amount of hot water is pumped into the heater core, no matter if engine is at idle or high RPM. This ensures that always the same temp is there, on other cars without aux water pump the volume of hot coolant into the heater core depends on the RPM of the engine = idle, it gets cooler, because the main water pump is driven via a belt, the aux water pump electric. Aux pump is not the same as water pump. It is electric and forces coolant flow after You turn the car off. The car blows warm air after 2 or 3 minutes thanks to this pump.

Aldus google...maar niet waar deze zit en hoe te testen