90 bonneville ac

I have a question. I have a 90 Bonneville and the A/C has freon in it and the blower motor is blowing hard enough I should be blown out of the seat. But There isn't hardly anything coming out of the vents. What should I do and where should I start to fix this problem. I assume the flapper isn't open or more air would be coming out. How do I get to it and where do I start in this process.

you first want to start with vacuum lines under hood leading into car on passenger side there may be a bad line there,,then go under dash in glove bax area and start checking actuator doors for vacuum problems,,unless you have digital climate control then it would be operated by a small electric motor and a bunch of vacuum sensors ,,look for all vacuum hoses under dash,,if you need more help message me private as I am all over this site and dont always remeber who I helped last lol. good luck!

Bravo! Good description, Jim.

I do have something to add though. The climate control defaults to defrost vents in the event of a vacuum loss. Also, about 10% of the airflow will be directed to the floor vents by design. The most likely cause of your problem is a disconnected or broken vacuum line at the vacuum tank [reservoir] located next to your brake booster.

The vacuum source comes from the vacuum manifold on the top of the motor between the throttle body and intake manifold. Check there first and then work your way down the line as described above.