ok, so when im driving my wife keeps sayin theres a cold draft on the passenger side. she was drivin tonight and i sat shotgun and damn if it wasnt wicked cold on my feet. so i did what any drunk guy would do and started pulling things apart on the ride home. poped the glove box down and found the vent behind it has blastin the cold air from outside, no matter what setting the heat was on..any ideas?

 

i have a small similar problem on a 2002.. It appears there are 3-4 different vacuum operated doors that direct the air to the dash, defrost, and floor vent. There is also a door that gets "fresh air" from outside. It appears the door does not seal well. I have not looked into it much, but if you stand on your head and find a vacuum cylinder and crank mechanism, you might try to disconnect the crank and clamp -tie the door completely closed??

 

thats what i was thinkin, i didnt know if it had any effect on the A/C.

 

ok, i got out and checked into the problem for a lil bit..after dropping the glove box you can clearly se the vent thats open. I tryed to disonect several vacum lines to get it to close and nada. i just got my fingers in the vent and felt down twards where i think the door is and felt the door(i think), but it was really loose,asif its off hinge.

its cold out so its gonna be somthing for a warmed day since it looks like im gonna have to drop the heater box, soooo, i just thru a strip of cardboard and some ducttape on it to keepthe air out

 

im curious, where do you put ehe cardboard ? area you covering a discharge hole from the duct to the floor, or did you put carboard inside the duct by the inlet door?

 

THis is a F150 description, but you get the idea-------

Heater/ AC vacuum door air routing thru the duct

OFF
When OFF is selected:

--The A/C inlet duct door is at full vacuum, closing off outside air and admitting only recirculated air.
--The panel/defrost door is in the no vacuum position, closing the passage to the instrument panel A/C registers.
--The floor/panel door is at full vacuum, closing the passages to the panel/defrost outlets.
--The blower motor and the A/C compressor are off.

PANEL/FLOOR
When PANEL/FLOOR is selected:

-The air inlet duct door is at no vacuum, blocking the recirculated air passage and admitting outside air.
--The panel/defrost door is at full vacuum, closing off airflow to the windshield defroster hose nozzle.
--The floor/panel door is in the partial vacuum position, allowing airflow to both the heater outlet floor duct and the instrument panel A/C registers. There is also some airflow to the A/C side window demisters.
--The A/C compressor will be enabled when PANEL/FLOOR is selected.
--The blower motor is on.

FLOOR
When FLOOR is selected:

--The air inlet duct door is in the no vacuum position, blocking recirculated air and admitting outside air.
--The floor/panel door is in the full vacuum position, directing all airflow to the heater outlet floor duct.
--The temperature can be adjusted to mix airflowing through and around the heater core to achieve the desired temperature level.
--The panel/defrost door is in the no vacuum position, blocking air circulation to the instrument panel A/C registers.
--The A/C compressor will be disabled when FLOOR is selected.
--The blower motor is on.

FLOOR/DEFROST
When FLOOR/DEFROST is selected:

--The air inlet duct door is in the no vacuum position blocking recirculated air and admitting outside air.
--The panel/defrost door is in the no vacuum position directing airflow to the windshield defroster hose nozzle.
--The floor/panel door is in the partial vacuum position, allowing airflow to both the windshield defroster hose nozzle and the heater outlet floor duct. There is also some airflow to the A/C side window demisters.
--The A/C compressor will be enabled when FLOOR/DEFROST is selected to dehumidify the air and reduce windshield fogging.
--The blower motor is on.

DEFROST
When DEFROST is selected:

--The air inlet door is in the no vacuum position, admitting outside air.
--Both the panel/defrost door and the floor/panel door are in the no vacuum position so that most of the incoming air is directed to the windshield defroster hose nozzle. There is also airflow to the A/C side window demisters.
--The temperature setting will determine the amount of air that is directed through the heater core and the amount that bypasses the heater core.
--The A/C compressor will be enabled when DEFROST is selected to dehumidify the air and reduce windshield fogging.
--The blower motor is on.

 

i might have to post a pc in the morning, i put it over outer vent on the heater box, not the outside vent feeding into the heater box...if that makes any sense

 

it appears the door is normally open and has cold air ocming inside. If you have vacuum on the door, then it uses recirc air inside the cab.

 

i think the door is some how broke and loose on top of the heater box

 

it appears on most situations, the door is shut aginst the recirculation portion and the outside air is open to the heater.. is it possible the door does not close off the recirc port and the cold air enters the box and then comes out the recirc opening into the floor area? where do you think the cold air is exiting the duct box?

 

not on theor, its from right behind the glove box, where i would think the box would bring in the cabin air to recirculate it..maybe?

 

It sounds like your recirc door (aka fresh air door) has broken off from it's pivots and fallen down on top of the blower motor. There is a good tutorial on how to replace that door without actually removing the entire dash over on the denslor tool website. It is a big job though. I used to have it bookmarked but can't find it right now. I'm sure you can find it if you search around there a bit. If you can't find the link I will look some more later when I have time. Good luck.

 

Do a search,,"04' Explorer Fresh air door" on FTE,,I fixed mine and it aint never fallen off again!!

 

m350 might be right, or at least in the right area...

https://www.ford-trucks.com/forums/8...r-trouble.html