The Test Condition(s) can be performed on the driver or passenger side controls or also the rear controls on vehicles equipped with rear A/C.

Test step/Test scope	Test condition	Nominal value	Possible cause/Remedy 1)
1.0 Defrost	Display ° Press . Fan speed wheel set to .	Blower runs with increased speed. Air venting from upper outlets. A/C compressor engaged. Maximum heat output. Charcoal filter off, 100% fresh air.	23 1.0 , 2.0 , 3.0 , 14.0 , 15.0 , 16.0 18.0 , 19.0 , 20.0 , 21.0
2.0 Total ventilation in cooling mode	Display . Fan speed wheel set to .	Blower runs with increased speed. Air venting from center outlets. A/C compressor engaged. No heat output.	23 15.0 , 16.0 , 18.0 , 19.0 , 20.0 33 /2
3.0 Normal ventilation in regulating mode	Fan speed wheel set to . Set temperature selector to passenger compartment temperature.	Blower speed decreases. Air venting from lower outlets, leak air from upper outlets. A/C compressor engaged. Tempered air exhaust. Simultaneous cycling of duovalve and coolant circulation pump.	23 16.0 , 18.0 , 19.0 , 20.0 , 21.0 , 22.0 , 24.0 , 25.0 , 26.0 , 27.0 , 33/2, 33 /3
4.0 Center air outlet "warm"	Display . Press warm air switch on center outlet (red). Fan speed wheel set to .	Heated air from center outlets. Blower speed increases.	23 17.0 , 23.0 , 24.0 , 33 /3
5.0 Center air outlet "cool"	Display . Press cool air switch on center outlet (blue). Fan speed wheel set to . Press button.	Cooled air from center outlet.	23 17.0 , 23.0 , 25.0 , 33 /2
6.0 Economy in heating mode	Display . Press button. Fan speed wheel set to .	Cool/warm air switch on center outlet OFF Air venting from lower and side outlets, leak air from upper outlets. Maximum heat output.	23 17.0 , 23.0 , 24.0 , 25.0 , 33/2, 33 /3

1) Observe Preparation for Test, see 22 .

VEHICLES WITH REAR A/C
Press both buttons, fan speed wheel set to , both temperature selector wheels set in "white" area BEFORE proceeding with Test Conditions.

Test step/Test scope	Test condition	Nominal value	Possible cause/Remedy 1)
7.0 Rear A/C ON	Both temperature selector wheels in "white" area. Ensure that the rear A/C fan speed wheel is not set to "0" (Off). Push air distribution slide to the top.	No air venting from beneath seat outlets. Rear A/C blower running. Air venting from outlets.	See 23 /11-15
8.0 Cooling operation	Ensure that the rear A/C fan speed wheel is not set to "0" (Off). Set both temperature selector wheels to "blue" detent. Push air distribution slide to the bottom.	Rear A/C blower running. Cool air venting from outlets. Cool air venting from beneath seat outlets.	See 23 /11-15
9.0 Heating operation	Ensure that the rear A/C fan speed wheel is not set to "0" (Off). Set both temperature selector wheels to "red" detent. Push air distribution slide to the bottom Push air distribution slide to the top.	Rear A/C blower running. Warm air venting from beneath seat outlets. Warm air venting from outlets in center console.	See 23 /11-15
10.0 Full heat operation	Display in N22: Ensure that the rear A/C fan speed wheel is not set to "0" (Off). Temperature selector wheels front A/C panel set to "red" detent. Push air distribution slide to the top.	Rear A/C blower running. Warm air venting from beneath seat outlets and from center console outlets.	See 23 /11-15

1) Observe Preparation for Test, see 22 .