Freezer makes a high-pitched whistling or whooshing noise during operation.

Safety first: No dangerous work is required; these noises are often normal.

Steps:

• Identify source: Listen carefully to locate whether the noise comes from inside the cabinet or the rear.
• Check fan area: Ensure no packaging or loose plastic parts are near the evaporator fan.
• Secure ducts: If plastic air ducts vibrate, add small foam pads or felt strips (heat-resistant) at contact points to reduce noise.
• Monitor: Mild whooshing or gurgling is usually normal for Grundig freezers and does not indicate a fault.