why does my a/c flow move from vents to defrost when I accelerate?

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when I reach 40 mph, the air flow moves from the vents to the defrost; when I slow down, the airflow returns to the vents.

hillbrenda95 in New Braunfels TX

Jul 4, 2011

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What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 2004 Ford Explorer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

Popular Answer

why does my a/c flow move from vents to defrost when I accelerate?

What is your question?

when I reach 40 mph, the air flow moves from the vents to the defrost; when I slow down, the airflow returns to the vents.

hillbrenda95 in New Braunfels TX

Jul 4, 2011

1 Reply

Popular Answer

David Jon Jul 6, 2011

The mode doors which control air flow are vacuum operated. You truck more than likely has a vacuum leak. This could be anything from a pinhole in a line, a leaking actuator or cracked vacuum reservoir.

hillbrenda95on Jul 6, 2011

Thank you so much, David J!

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Popular Answer

What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 2004 Ford Explorer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.