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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Heater Control Valve: Testing and Inspection

Output Check

Symptoms:

Heater emits cold air.
1. Engine running: Check coolant valve opens as a temperature control is moved from COLD.
2. Check for engine running cold.
3. Check heater pipes and hoses for blockage of restriction.
4. Check heater matrix for blockage or restriction, flush system.

Heater emits warm air.
5. Engine running: Check coolant valve closes when both temperature controls are moved to COLD.