I have 2003 f-150 whenever I turn the a/c on it shoots out the vents then straight to the defrost.when I turn the a/c off air comes through the vents fine.

Asked by Jun 10, 2015 at 10:08 AM about the 2003 Ford F-150 Lariat Crew Cab SB

Question type: Maintenance & Repair

4 Answers

1,575

Sounds like a blend door motor/actuator problem.

247,425

Sounds like a vacuum hose issue. If there is a crack/leak in the system, all air is diverted to the defrost vent. Get under the hood along the firewall and check your vacuum hoses.

1 of 1 people found this helpful.
247,425

Look for the small vacuum line routed near the battery that goes from the intake through the firewall.

1,575

Now that you said that, I do agree that your response sounds correct. Kudos to you Tom.

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