Failure of the component

If the front refrigerant shutoff valve fails, the following behavior is to be expected:

• Vehicles with rear air conditioner
  • Fault entry in the HKA control unit
  • Refrigerant circuit to the front evaporator of the heating and air conditioning system blocked
• ActiveHybrid vehicles
  • Fault code entry in the electrical machine electronics (EME)
  • Refrigerant circuit to the front evaporator of the heating and air conditioning system blocked

General notes 

If a rear air conditioner (HKA) is installed, the integrated automatic heating and air conditioning system (IHKA) must be encoded to "HKA is installed". Reason: The IHKA control unit is the master, the HKA control unit is a slave. Otherwise the built-in refrigerant shutoff valves (front and rear) remain closed and have no function.

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