My AC and Heater BOTH suddenly stopped working however the blower still blows ambient air at whatever velocity I choose. On my control panel, the only button/switch that works is the fan velocity. I can make it blow fast or slow but it's only ambient air and it only comes through the face vents. The temperature button/switch does nothing. The selector for which vent (feet, face, defroster) the air comes from does nothing. The snowflake button for the AC does nothing!! I've checked the fuses and relays and couldn't detect a problem so WHAT NOW?! Anyone??
Could be a diverter door stuck, cable/solenoid broken.
I would suggest changing the control head. You should be able to source a used unit from a local salvage yard.
SOURCE: 2001durango vent only blows air through face vent and defroster.
the vent door is broke in the heater control box under dash
SOURCE: ac will not blow thru ac vents, only thru defrost vents.
if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system
SOURCE: heating / air conditioning control stuck to front defrost vents
There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.
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