Checking A/C System Operation With No DTC's

Tests 1 - 2:

Tests 3 - 7:

Tests 8 - 12:

Tests 13 - 15:

SYMPTOM
CHECKING A/C SYSTEM OPERATION WITH NO DTCS

POSSIBLE CAUSES
- Check for PCM DTCS
- Refrigeration system not properly charged
- High press cut-off switch
- Low pressure switch
- Powertrain control module
- A/C clutch coil
- A/C compressor clutch ground circuit open
- A/C clutch relay output circuit open
- A/C request circuit open
- Fused B(+) circuit open
- A/C clutch relay
- A/C - heater control module/AZC module
- Body control module
- Check A/C switch signal circuit for an open
- A/C switch signal control circuit open