Pontiac Transport Low Airflow From Vents

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1998 Pontiac Transport / Montana.
A/C system purged, vacuum tested good and serviced. Work done to repair = 2 years ago changed the dash selector unit. Question = With the A/C system fully serviced, the air is cold, dash selector working, hot/cold selector working, the fan seems to have 5speeds but will not push out the A/C more than 6 inches. Not sure if my problem is fan motor or ducting, heater system works good.

Answer: If you are able to switch between floor, vent, and defrost and the airflow is low in all positions, then sounds like a blower motor problem. Possibly something in the fan- this will usually cause a noise when the fan is on. Or the in-cabin air filter are plugged. These are accessed from the inside the glove box. A small trap door in the back of the glove box houses the filters.

Question:
Pontiac trans sport 3.8 v-6 overheating and turning motor off?

Answer:
Can you give a little more information please? Any repairs prior to this? How bad is it overheating? Usually an overheat problem doesn't shut the engine off, so can you describe that a bit better please?It is boiling water and steam coming out of catch tank.

You probably have had a catastrophic failure. More than likely you have blown a head gasket. The V6 engines like yours have had many troubles with this type of problem. Unfortunately, you're going to have tear down the engine to find the problem.

The car overheats boiling water steam put new 80 thermostat in car overheats shuts down. It makes a suction noise when water is put in cooling system. That is because air is getting pumped into the cooling system from the bad head gasket. You're going to have some major repairs done to fix this.