Yes, it could be the blend door. Some are manual and some are powered by a motor. The cable(s) that move the door could have broken or come unhooked, or it could be the motor.
Hello
u'd need a proper manual for this in my opinion
like there are plenty of dealers and online shops that deal in those..
you can get some free at reliable-store and it;s actually really illustrative
SOURCE: Blend door not working.
The bleed door controls air temp not where it comes out, dash, floor, defroster, this is most likely a mode control switch problem, that switch is on the ac control head.
SOURCE: Blend door not working.
check the vacuum supply and vac lines from the control head for a leak
SOURCE: Jeep AC blows cold air at defrost and feet but not through vents
There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.
SOURCE: Blower only pushes air through defroster. 96 Jeep GC
There is a vacuum leak under the hood. On the 4.0 liter it is usually at the intake manifold near the brake booster. The 90 degree vacuum fitting pops off of the nipple of the intake. On the 5.2 liter the vacuum leak is usually near the battery where acid corrodes through the line as it passes near the battery box to the reservoir under the box.
SOURCE: Heat/air vents for defrost and feet setting not
I think your problem is mechanical. There is a distribution box behind thedash where flaps divert air to the specific locations although they may be electrically or vacuum actuated it is probably a mechanical linkage to these flaps or something is creating an obstruction. Check all the other connections while you are in there including any duct work to these areas
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