Question about 2005 Ford F 350 Super Duty
If air is coming thru defroster then you have a vacuum leak.Defrost is the default postion(no vacuum).Look under hood on the passenger side next to heater core area and see if you can find the small black vacuum line going thru the firewall.Trace it back to the vacuum canister on right side of engine or fender well and make sure nothing is disconnected or leaks in the line and trace it from canister back to the source also.
Posted on Mar 03, 2009
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Posted on Jan 02, 2017
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