If no defect is determined here, the potentiometer’s limit values need to be tested using a diagnostic tool. In this case, first check the engine harness and the correct fit of the vacuum hoses. If the fault listed above is determined, it may be caused by a defective intake-manifold flap potentiometer. Indicating port deactivation position sensor circuit voltage too low / too high. Opel Astra G / H - Engine does not run smoothly | HELLA Opel Astra G / H Model year: from 2003/2004 Engine: Z16XEP Engine control lamp comes on Engine does not run smoothly Fault code: P1113

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The fan speed changes when the flap is closed for the same reason a vacuum cleaner speeds up when its inlet or outlet is blocked. The solenoid can also be disassembled for more severe rust removal measures. Remove the solenoid valve and squirt some rust penetrating solution into the three ports. The rust buildup will cause the poppet to stick, usually in an open (fresh air only) position. The solenoid is vented and water will sometimes migrate in causing the poppet spring to rust. The problem is either in the electrical switch in the dashboard (rare), or the solenoid on the fender wall behind the battery is stuck (much more common).

If the flap had been open, but closes when the engine is operating then the flap actuator and vacuum lines are OK. Start the engine to generate a vacuum from the vacuum pump. It may take longer to heat the interior, but no condensation issues. If the cylindrical fan is visible then the flap is open. If the flap is stuck in closed or recirculation position you will not see the cylindrical fan and you'll have condensation buildup problems this winter. The flap will be visible, but the actuator won't. Remove the cabin pollen filter located under the cover under the passenger's side wiper. Determine in which position the air flap is stuck.

Astra mk4 recirculation flap