Question about 2004 Ford F250

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Only blowing through defrost vents

After coming home from deployment (truck sat for 8 months), my 2004 F250 will only blow through the defrost vents no matter what position the selector is in.

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Defrost is fail safe mode. cehck for a broken vacuum line from the engine to the heater control head. check vacuum reservoir under hood for leaks.

Posted on Oct 04, 2009

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2 Answers

02 SILVERADO. AIR ONLY BLOWS OUT DEFROST VENTS. REPLACED CONTROL PANEL. NO LUCK


I had a similar issue on an 05 silverado. Air would only blow out of defrost vents. But this worked for me:

1) Unplug HVAC fuse for 10-30 seconds
2) Start truck
3) A/C comes out defrost - wait about 10 to 15 secs
4) A/C then starts coming out the floor vents for about 5 seconds
5) A/C then starts coming out the dash vents.
6) While the A/C is coming out the dash vents, turn A/C OFF (otherwise it cycles back to defrost for good).
7) Turn truck OFF
8) Restart truck and it should work fine

(Found solution on another forum from user "ccurran")

May 15, 2011 | 2001 Chevrolet Silverado 1500

1 Answer

2000 ford f250 a/c blows through vent when stopped you take off and it blow through defrost vents


Look over on thw passenger side under the hood, close to where you recharge the a/c, going into the fire wall, will be a vacuum line with a one way valve tie into the vacuum line, disconnect it and blow through it, should only be able to blow through it one way, if it does it both ways bad valve, replace it.That's what holds the vacuum for the vents.

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1 Answer

Air not blowing through vents


Most likely the louver doors that control were the air comes out are frozen in place. or there is a vacuum leak that will not allow enough vacuum to move the doors. I hope this helps please rate this thank you

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1 Answer

I have a 2001 F250 Superduty 7.3l Diesel. When I


I had a problem with vacuum in my F250 diesel. It had a new vacuum pump but would kick out of cruise control every time the vacuum pressure dropped. It turned out to be the vacuum reserve cannister had holes in it.

Seems you reach a tipping point and then all the vacuum systems mess up. You might want to check the reserve cannister and any vacuum servo your 4x4 might have. You can check most of the vacuum stuff with the engine OFF using a vacuum pump. You could have a leaking vacuum pot operating the ductwork. Check your diesel vacuum pump for output and loose belts.

Jan 07, 2010 | 2000 Ford F250 Super Duty Crew Cabs

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2002 F250 A/C and heater air flow issues


On my F-250 it does the same but the great thing is that the hot/cold air is not hitting me in the face until it get the right temperature to come out of the vents.

Jul 15, 2009 | 2002 Ford F250 Super Duty SuperCab

2 Answers

Air conditioning blows through defrost vents only


AC blows where you have your control switch set,if it only comes out your defroster have the vacuum check at the blend air doors or if you have a faulty heater control unit.

Jul 13, 2009 | 2004 Ford F150

1 Answer

Dash vents will not blow air. Defroster and floor vents blow fine.


Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

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2 Answers

Heater/AC only blowing out of defroster vents


vacume hose off or cracked it wont change to floor heat ooorrr field mice have made them selves a home in your heater box

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