Test step/Test sequence	Test condition	Nominal value	Possible cause/Remedy 1)
1.0 Defrost	Press Temperature selection at random setting	Blower runs with increased speed. Air venting from defroster outlets. A/C compressor engaged. Maximum heat output, 100% fresh air	23 9.0 , 14.0 , 15.0 , 16.0 , 17.0 42 1.0 , 2.0 , 3.0 , 4.0
2.0 Ventilation in cooling mode	Press Temperature selection " "	Blower runs with increased speed. Air venting from center and side outlets. A/C compressor engaged, no heat output.	23 9.0 , 14.0 , 15.0 , 16.0 , 17.0 32 3.0 , 4.0 42 1.0 , 2.0 , 3.0 , 4.0
3.0 Normal setting in regulating mode	Press Temperature selection set at present in-car temperature.	Blower speed decreases. Air venting from defroster outlets, leak air from footwell outlets. A/C compressor engaged. Tempered air venting. Duovalve cycles and auxiliary coolant pump runs.	23 9.0 , 14.0 , 15.0 , 16.0 , 17.0 32 7.0 42 1.0 , 2.0 , 3.0 , 4.0
4.0 Economy not in heating mode	Temperature selection " " Press Press	Air venting from dash outlets (ambient temperature) A/C compressor OFF.	23 14.0 , 15.0 , 16.0 32 1.0
5.0 Economy in heating mode	Temperature selection Press	Air venting from footwell and side outlets left/right. Leak air from defroster outlets. Maximum heat output.	23 14.0 , 15.0 , 16.0 32 1.0
6.0 Residual engine heat utilization	Ignition: OFF Press Selected temperature > )	Heated air from footwell and side outlets, leak air from defroster outlets. Blower runs at low speed.	23 14.0 , 15.0 , 16.0 32 1.0

1) Observe Preparation for Test, see 22 .