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1997 Ford F-250 HD Base HD Reg Cab 133.0 WB

1997 Ford F-250 HD
Trim Info:
Rear Wheel Drive, Reg Cab 8' Styleside
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September 27, 2011, 6:59 pm

Dallas B

Question: air conditioner air flow

when air conditioner is on MAX, sometimes air flow changes to defrosters,then a few minutes later changes back to dash vents. then a few munutes later back to defrosters. back and fourth , but not on normal, only MAX.

October 3, 2011, 8:53 pm

Elizabeth K

That is often caused by a vacuum leak. See this thread for more information:

1/1 users found this helpful.

February 13, 2013, 4:11 am

Dallas B


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February 13, 2013, 9:01 am

Elizabeth K

You may find some reviews of shops in your local area on

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May 1, 2013, 3:02 pm

Dallas B


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June 14, 2013, 4:13 am

Dallas B

The vacuum line, for the fuel pressure regulator, was the problem. The line comes off the intake. Thank you.

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