Check for loose connections in the wiring..
SOURCE: 98 Olds LLC - AC works but fan air does not blow
If you have a late model GM car
and the system is controlled electronically the blend door actuator becomes weak. When this situation occurs it will not move the air direction door inside of the heater/air conditioner plenum. in your case not to the vents Replace the actuator with new and recheck the system. i hope this helps
SOURCE: The heater fan on my 2006 GMC Sierra only blows to
Most likely is your blend door is faulty (bad motor/broken tab?).
Defrost is the idle possition ( as it is the most important).
You may have a disconnected vacuum hose from the climate controle panel if you recently (ever?) had work done in the dash area...
But my suspicion is the blend door motor...
SOURCE: My a/c (heater & Defrost) doesn't always work, could it be a fuse or the fan blower?
possible cause bad control switch.if blower motor runs okay in AC MODE AND HEATER MODE,THE CONTROL SWITCH COULD BE THE CULPIT OF THE PROBLEM.
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