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Diagnostic Manual, Climate Control, Volume 1

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LOCATION:    3.3 Air Conditioning (A/C)    >   11 Diagnosis - Function Test


Diagnosis - Function Test

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 .