Operation CHARM: Car repair manuals for everyone.
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

Test H: Temperature Control/Function Selector Is Inoperative

PINPOINT TEST H: TEMPERATURE CONTROL/FUNCTION SELECTOR IS INOPERATIVE


H1-H4:






H4 Continued:






Normal Operation
Under normal operation, the discharge temperature and airflow mode is determined by the temperature selector and the function selector.

Possible Causes
- Temperature selector/cable assembly
- Function switch/cable assembly
- Airflow mode door/temperature blend door actuating assembly
- Temperature or airflow mode door