During a January walkaround at ORD, you notice both inlet and extract valves are closed. What should you do?

When conducting a walkaround of the aircraft, noticing that both the inlet and extract valves are closed during cold weather operations is expected. This condition is considered normal, particularly in colder temperatures where the closed valves help to prevent cold air from flowing through the system, allowing the aircraft's systems to maintain a comfortable environment and avoid potential icing.

While it's important to ensure that all systems are functioning properly, the closed valves in this scenario do not automatically indicate a malfunction. Therefore, proceeding with the walkaround without concern is appropriate in this situation, as long as no other indicators or alarms suggest an issue.

Other options may imply further actions that are unnecessary given the context. For example, listening for a horn or calling Maintenance might indicate a problem that simply isn't present at this stage. Cycling the BLOWER and EXTRACT fan switches would also be irrelevant if the aircraft is on the ground and the conditions are as described. Thus, recognizing that closed valves are typical behavior in this scenario leads to a clear understanding of how to proceed during the inspection.