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

9,835

Check for vacum leaks.

3 of 3 people found this helpful.
116,055

And again we agree

2 of 2 people found this helpful.
71,875

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 of 2 people found this helpful.

Your Answer

F-250 Super Duty

Looking for a Used F-250 Super Duty in your area?

CarGurus has 55,732 nationwide F-250 Super Duty listings starting at $1,899.

ZIP:

Ford F-250 Super Duty Experts

  • #1
    Tracy Hooks
    Reputation
    890
  • #2
    Tom Demyan
    Reputation
    690
  • #3
    kbro
    Reputation
    670
View All

Related Models For Sale

Used Ford F-350 Super Duty
371 Great Deals out of 29,577 listings starting at $3,995
Used Ford F-150
3,310 Great Deals out of 248,814 listings starting at $1,295
Used Chevrolet Silverado 2500HD
356 Great Deals out of 33,930 listings starting at $2,499
Used Dodge Ram 2500
160 Great Deals out of 5,375 listings starting at $2,500
Used GMC Sierra 2500HD
117 Great Deals out of 16,000 listings starting at $2,799
Used Chevrolet Silverado 1500
2,762 Great Deals out of 203,300 listings starting at $599
Used Ford F-450 Super Duty
36 Great Deals out of 2,677 listings starting at $4,995
Used GMC Sierra 1500
1,271 Great Deals out of 73,430 listings starting at $1,750
Used Toyota Tundra
674 Great Deals out of 39,328 listings starting at $2,900
Used Dodge Ram 3500
69 Great Deals out of 2,309 listings starting at $5,999
Used Toyota Tacoma
756 Great Deals out of 52,589 listings starting at $2,500
Used Dodge Ram 1500
432 Great Deals out of 11,229 listings starting at $1,499

Used Cars For Sale

2017 Ford F-250 Super Duty For Sale
21 Great Deals out of 37,739 listings starting at $24,010
2016 Ford F-250 Super Duty For Sale
34 Great Deals out of 2,288 listings starting at $21,605
2015 Ford F-250 Super Duty For Sale
19 Great Deals out of 2,493 listings starting at $11,958
2014 Ford F-250 Super Duty For Sale
8 Great Deals out of 1,015 listings starting at $8,926
2013 Ford F-250 Super Duty For Sale
21 Great Deals out of 953 listings starting at $8,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.