Question about 2002 Ford F250 Super Duty SuperCab

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

I have a 4 door 2006 f 250 diesel,when i put my truck in 4 wheel drive my a/c blower redirects my air from the dash to defrost vents.please help! thanks
scott

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  • yadayada
    yadayada May 11, 2010

    check your vacuum pump and the vacuum resovior.

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  • Ford Master
  • 6,918 Answers

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

Posted on Jul 20, 2009

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1 Answer

After fixing blower motor it only blows out defrost


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How to Replace a Blower Fan in an Excursion


Blower Motor
See pics bellow Removal
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  1. Remove the bolts (7.3L diesel engine).
  1. Disconnect the vacuum hose and remove the vacuum pump and mounting bracket (7.3L diesel engine).
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  1. syo%7eus%7een%7efile=ani_caut.gif%7egen%7eref.gif CAUTION: Carefully remove the blower motor so as not to damage the wheel.
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Installation
  1. Follow the removal procedure in reverse order.




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Jan 11, 2012 | 2000 Ford Excursion

1 Answer

My blower only blows threw the defrost vents. all climates everything, no matter where i put the control knob. dealership says the solenoid got stuck closed after using my 4 wheel drive.


Assuming you have vacuum controls at the heater control head, you have a classic vacuum leak in the hose from the engine intake manifuold to the control head, or the vaccum storage canister somewhere in the engine compartment. It is required to fail to defrost by law.

Climate Control Assembly
The climate control assembly has 3 system controls:
  • The function selector switch combines a vacuum selector valve with 2 electrical switches to supply battery positive voltage (B+) to the blower motor control circuit and the A/C clutch circuit (if equipped).
Vacuum Control Motors
The 2 vacuum control motors:
  • are actuated by vacuum from the function selector switch.
  • position the plenum doors to direct system airflow to the vehicle's interior as determined by the function selector switch setting.
The vacuum reservoir is behind the driver fender well, black plastic ball.

If you have diesel, then you will have a vacuum motor under the hood.

please rate if this helps.

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Oct 05, 2011 | 2006 Ford F-250 Super Duty

1 Answer

2004 Dodge Ram 3500 Turbo Cummins diesel, air conditioning is cold but there is very little air pressure even when turned on high, fan sounds like it is blowing like crazy but very little air movement...


Sounds like the "Blend Doors" are not completely closed (or opened). The Blend Doors open and close to direct the air from the blower motor to the vent selection you have made on the control panel (defrost on windshield, floor, front, etc) You may need to try various selections to see if the blend doors actually open or close. If no changes, it could be a blend door actuator failing.

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1999 mercury villager put in new blower motor and resistor. Every so often when change modes from defrost to lower for example or on start up it blows the front blower motor fuse. the blower motor is a...


it could be the electronic blend door motor. Try not changing any settings for a week and see if the fuse blows. Leave it on floor/defrost.

usually it is the bearing in the blower motor going bad. I believe it's a 25 amp fuse. The motor draws about one amp for each volt increase up to 14 volts.

go to our site for more help.

http://groups.yahoo.com/group/villagerquest/

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1 Answer

DAEWOO MUSSO , NO FOUR WHEEL DRIVE. MODEL 1999,2.9 DIESEL.


Take the actuator off and see if it is moving fully to all positions. While it is off see if you can manualy put truck in 4 low and 4 high.

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2 Answers

Air only blows on defrost (windshield)


Check vacuum lines on firewall for leak, check all vacuum lines if one on fire wall is ok , doors work off vacuum

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1 Answer

2003 automatic four wheel drive not working


well can get a new car that 6557 code is a blower moter code

Nov 20, 2017 | 2004 Dodge Ram 3500 Truck

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