Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Checking A/C System Operation With No DTC's

Tests 1 - 4:

Tests 5 - 9:

Tests 10 - 11:

SYMPTOM
CHECKING A/C SYSTEM OPERATION WITH NO DTCS

POSSIBLE CAUSES
- A/C clutch relay DTC present
- Refrigeration system not properly charged
- High press cut-off switch
- Low pressure switch
- A/C request circuit open
- A/C select circuit open
- A/C clutch coil
- A/C compressor clutch ground circuit open
- A/C clutch relay output circuit open
- Fused B(+) circuit open
- A/C clutch relay