Temp blend door may be stuck. If it also will not go from defrost to AC the mode door may be bad also. Possible linkage or connection issue .
Dodge Ram Pickup 1500 Service Repair Manual Manual 1999
to fix your car go to this link
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: The front AC on my 2005 Dodge Grand Caravan does not work at all.
probablt front blower motor or switch,can test blower motor by running auxiliary power and growd to front blower motor.Can test switch with DVOM.
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.
SOURCE: 2003 dodge durango front AC vents not working
had this trouble in a dakota it was a blend door in the heater unit. had to remove entire dash to repair
SOURCE: 2000 Dodge RAM no HEAT/ New heater core / AC evap.
There is a actuator on the right side of your leg while sitting in the drivers seat under the dash. It has a plastic rod for actuation manually actuate this diverter and should be the problem.
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