Aircondition fan motor changed running ok but little air through vents

make sure all air hoses are connected properly to blow motor and under the dash.

What kind of vehicle? You can often times smack the box that the blower motor is mounted in and it will often stay working again on many vehicles. I've been lucky a few times

you might want to recharge your air compresser or the heater coar thats my guess it worked on my truck

Take your dash off. Then look at your air vents to see where the missing air duct is. Hope this helps, james Booth

chek your airconditions filter

Likely you have a blend(air control) door that is malfunctioning or you have debris stuck in blower fan (you would not believe what I have found in some) If noise changes, likely the motor is working and the problem is not electrical.

Either Your fan switch is burned out or you blower motor is no good, your blower motor is on the passenger side under the dash. Before you replace any parts you need to check your fuses and relays under your hood and in the car. Usually if your fan switch goes bad you will still get some air blowing thru the vents, so my guess would be blower motor, If its not a blown fuse or relay.

is the fan motor working at full speed
check for blocked cabin air filter
the vacuum only works the vent controls and as you can feel the changes of the vents , it is not vacuum

it's either a fuse or it's a bad blower motor, it could be a bad blower motor resistor but usually you'll get either high or low only, so if you have nothing on any speed, high low etc, and all the fuses are ok chances are it's your blower motor.

your blower motor might be damaged.replace the blower motor of the air con.