Furnace stopped running motor locked up on the hottest day of summer. new motor and compositor changed. blower wheel spinning fast, motor running. cold air coming from vent but blowing very weak. little to no air flow.
Check your filter. If dirty lack of air with no return. You may also want to check if your coil over the furnace is clogged. Also, check the rotation of the blower motor you put in. Put paper up to return and see if it pulls it inward. If it is not pulling in on return then your rotation on the motor is reversed.
Does your return hold a piece of toilet paper? Fan possibly rotating backwards.
If the shaft from the motor is not securely connected to the fan, although it is turning, it may be slipping. Check that the set screws are tight between the motor shaft and the squirrel cage fan.
Otherwise, it sounds like you have duct problem. A rodent may have chewed a hole in the duct, or the connection between the and the delivery duct, or the connection between the delivery duct and the floor or wall grate has become disconnect. (This last is common, a screw holding the duct to the floor grate has come loose or the duct tape has come loose from gravity pull down on the duct to grate connection. If you have a basement or crawl space you have have to inspect that the duct work has not come apart.
SOURCE: Air conditioner works but not blowing out the vents
Check the air directing servo motors under the glove box. they are 2 black boxes about 3"x3". you have to clean the contacts of grease with contact cleaner spray or alcohol.
SOURCE: 1998 Mustang - AC blows only through Defrost vents
You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.
SOURCE: air and heat not blowing air through vents
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.
SOURCE: HOT & COLD ELECTRIC VENTS NOT MOVING.
Blend door actuator. When it fails for some reason it turns to the hot side and gets stuck. Dash must come out. I usually do it in 3 hours, because I've done it numerous times.
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