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)

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Cabin Temperature Sensor / Switch: Description and Operation

The in-car temperature sensor:
^ is located in the instrument panel to the right of the steering column.
^ contains a thermistor which measures the in-car air temperature and sends that reading to the EATC module.
^ utilizes a venturi system with an aspirator hose running between the in-car temperature sensor and the plenum chamber.
^ Airflow through the plenum chamber creates a suction through the aspirator hose which draws air from the passenger compartment through the in-car temperature sensor.