A/C blower switched from panel to defrost during acceleration

Asked by May 26, 2014 at 07:49 PM about the 2006 Ford F-250 Super Duty XLT Crew Cab 4WD SB

Question type: Maintenance & Repair

The airflow is switched from panel to
defrost during acceleration.  The airflow
switches back when I let off the accelerator.  

Had anyone else experienced this and have
a remedy?

3 Answers

9,365

Check for vacum leaks.

3 out of 3 people think this is helpful.
101,695

And again we agree

2 out of 2 people think this is helpful.
56,775

There's a check valve in the vacuum system. Either in the vacuum line coming from the intake manifold to the control panel on the dash or, if this is an automatic system, it may be inside the programmer. When you accelerate intake manifold vacuum drops off. That's why it is switching. The check valve's job is to hold the vacuum level in the system under acceleration. HTH. -Jim

2 out of 2 people think this is helpful.

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