It runs on high speed only and feel cold / hot air but not come out the vents fast or high speed

 

Blower on at high speed only speed that works can feel cool air but not coming out the vents

 

Help us out! What are working on? If this an A body it could be the fuse that's located on the driver's side fender liner???

 

Check the blower motor resister.

Gene

 

... And connect your vacuum lines.

- Eric

 

If your fan only runs on HI speed it's likely that the resistor in the AC plenum is bad. This is a common problem on Oldsmobiles through out the years. You can access the resistor from the engine bay, it's mounted in the AC box on the fire wall.

BTW, I merged your threads.

 

Yep. No vacuum means the air blows out the floor vents only.
Many times the hose to the vacuum reservoir on the firewall is disconnected.

This thread has a lot of pictures and info about a similar issue.

https://classicoldsmobile.com/forums...s-supreme.html