Question about 2006 Ford F-250 Super Duty

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I have a 2006 Ford F250 Diesel! The blower only blows through the defrost now, im told its a vaccum line leak, how do I find the leak?

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Similar issue with my friends Dodge. Its a safety default to ensure the driver can see (via defroster) in the event the electrical has an issue. This ocurres when someone works on the vehicle w/o disconnecting the battery. Will need re-flashed by the dealer or someone in the know.

Posted on Sep 30, 2009

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I have a 2006 f-250 diesel mine do the same thing if your 4x4 does not to the problem might the a switch it is located by the battery on the right side on the fender. also unplug the two vaccum lines and switch the lines on to the 4x4 and switch them around heater box and see if your blows like it shoud if so you need to replace that switch it is about 80.00 at ford. I hope that works for you

Posted on Aug 06, 2011

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Pressure test each vaccum line

Posted on Sep 23, 2009

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1 Answer

What is the pressure of the locking front hub when doing the leak test On a 2000 ford 250 super duty truck


The 4x4 system works on vaccum and not presure. If this is not a Diesel you may have a vaccum leak. Check your vaccum hoses from the wheeles back up to the intake for cracks. If this a Diesel Super duty the 4x4 system works off a small vaccum pump out under the hood on the passanger side right over the tire. There is no pressure it is vaccum. Run the A/C and see if the A/C is blowing up on the windshield or out the vents were it should. Change it to the floor and see if it changes, If it does not change the vaccum pump is not working. Check your fuses first. If they are ok check for voltage at the the vaccum pump. Check your ground as well. If you have voltage and the ground is ok the pump is bad.

Nov 23, 2011 | 2000 Ford F250 Super Duty Crew Cabs

1 Answer

On my 92 F250 the blower olny blows out the defrost on all the settings- like floor dash mix defrost


check your vaccum lines outside the interior
near the engine especially in the rear and on each side. Check for broken or unplugged vaccum lines
also inside near the main bundle. start the car and listen for hisses under the dash and outside under the hood, you may be able to hear the leak. Sometimes the modles themselves may be leaking
or if electrical switch may be faulty.

Feb 10, 2010 | Ford F-250 Cars & Trucks

1 Answer

1989 ford f250 a/c only comes out through the defroster


More them likely you have a vaccum leak, check vaccum line that gose into fire wall under hood make sure it has vaccum, if don't find vaccum hose and repair, if it does check vaccum hose under dash follow it make sure it's plug in, if it is could be a bad vaccum pull off or bend door or the selector switch. Good luck hope this was helpful.

Dec 02, 2009 | Ford F-250 Cars & Trucks

1 Answer

My 2004 f250 will only go into defrost mode after sitting for 8 months. All vacuum lines are hooked up and a/c and heat work fine, just goes into defrost mode.


after setting that long look for a vaccum line thats rotted or mice ate thru one disconnect the vaccum line going thru the front of dash into the car unplug arn see if you are getting vaccum there if not, trace it backwards until you find the leak.

Oct 11, 2009 | 2004 Ford F250

1 Answer

Climate control is on defrost only the auto


Check your vacuum pump located on the right side fenderwell. see if its running. Check the vacuum hose at the hubs for leaks or damage. repair if damaged. check for other vacuum leaks such as the grey hose going to the heater control valve.

Oct 03, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

A/c changes to defrost when i put truck in 4 wheel drive


Hello I am Ron ,,check for a vacuum leak or vacuum hose that has collasped under hood,and under dash.Hope this sheds some light on the problem

Jul 19, 2009 | 2002 Ford F250 Super Duty SuperCab

2 Answers

2001 f250 diesel


Had the same problem on my 2001 Super Duty.
Solution: leaking vaccume line to the auto locking hubs. It seems Ford saw fit to tie the two systems together. Once I fixed the lines to the hubs my vents worked properly.

Jun 05, 2008 | 2001 Ford F250 Super Duty Super Cab

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