Order of execution
1. Remove the filter without disconnecting the hoses (5) And (17).
2. Start the engine and let it idle.
3. Disconnect the hose from the valve. The damper should shut off the warm air supply.
4. Put a hose on the valve. The damper should allow access to warm air.
5. Disconnect hose. The damper should turn and block the access of warm air. If this does not happen, then the valve is faulty.
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