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

Diagnostic Flowcharts

Flowchart-Heater Core Temperature Sensor (Part 1 Of 2):

Flowchart-Heater Core Temperature Sensor (Part 2 Of 2):

Self-diagnosis indicator light D comes on: Indicates a problem in the heater core temperature sensor circuit. Use a digital multimeter (KS-AHM-32-003) to check it.

The heater core temperature sensor is a temperature dependent resistor (thermistor). The resistance of the thermistor decreases as the engine coolant temperature increases.