| 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 , 10.0 , 14.0 , 15.0 , 18.0
20.0
|
| 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.
|
32 Test A, B, C,
23 9.0 , 14.0 , 18.0 , 20.0 |
| 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.
|
32 Test A, B, C,
23 9.0 , 14.0 , 18.0 , 19.0 , 20.0 |
4.0 Economy mode,
no heating |
Temperature selection " "
Press 
Press  |
Air venting from dash outlets (ambient temperature)
A/C compressor OFF.
|
32 Test A, B, C,
23 18.0 , 19.0 |
| 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 , 18.0 , 19.0
32 Testing A, B, C |
| 6.0 Residual engine heat utilization |
Ignition: OFF
Press 
Selected temperature >   ° F (   ° C) |
Heated air from footwell and side outlets, leak air from defroster outlets. Blower runs at low speed.
|
32 Testing A, B, C,
23 14.0 , 15.0 , 16.0 , 17.0 , 18.0 , 19.0 , 23.0 |
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