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In this video I respond to a viewer's question! The Viewer described having intermittent cold air in her 2007 Ford Expedition...even after spending $2500 on a new AC system.
She replaced the AC Compressor, Blend Door Actuator, AC Lines, checked for full charge and still isn't getting any cold air on certain occasions. She also described hearing a clicking noise from her dashboard when trying to activate the AC that would go away when she hit a bump.
Hard to diagnose a Vehicle without being hands on but based on personal experience, and assuming the information offered was accurate, all signs point to a bad or stuck Blend Door Actuator.
I've had to replace my Blend Door Actuator in this very truck Twice in the past 2 years. They can become faulty very easily from strained use, overuse or just be bad or have a depreciated lifespan straight off the shelf
The Blend Door Actuator acts similar to a "Faucet" in your sink, allowing Hot and Cold air to mix, if broken in one direction it won't allow the proper and selected temperature to come thru! On my difficulty Scale this is a 4 out of 10 to replace!