My air blows out the air vents and the bottom but not at the top under the wind sheild why?

SOURCE: regal air conditioner blows out top vents

Sounds like a vacuum leak. The vents work by using vacuum to open them. When you accelerate the vacuum goes away and the vent door closes into it's resting position. Look under the hood for old brittle vacuum hoses or possibly one got knocked off during maintenance. Another possibility is a vacuum hose knocked off at the climate control maybe during aftermarket radio installation. It could be a bad climate control too because your always moving the lever, over time the control could be worn out and leaking vacuum. Fianlly it could be the actual actuator/piston that moves the vent that could be leaking.
If your lucky maybe you can hear the leak while the car is running, also when you turn off the car and listen (it might not be that loud so do it in a quiet location) for a 'sucking/blowing' if its a big leak it may happen quickly.
For a cheap fix if you can't find the leak you can install an additional vacuum reservoir. It won't make the problem go away but with the additional vacuum storage it will take longer before the vents loose vacuum.
Way back when, car makers used metal HI-C (the juice) cans, now you'll find a black ball about 3-5 inches in diameter as the vacuum reservoir.
Tip: You can use a short piece of hose put up to your ear, block your other ear and move the other end of the hose around the engine compartment to locate leaks or other noises you can't figure where there coming from.

SOURCE: i have no air flow in my mid vents

Check your air flow controller. Bet the damper motor isn't getting any air

SOURCE: heater/ac door actuator isnt workin right. air

Sounds like either the computer that controls the auto climate control has gone out or you could have a vacuum leak. I would definitely check the vacuum leak first. I took my 98 Lesabre to a repair shop several years ago for the same problem. When I picked it up they told me my computer was out and it would cost around $600 to fix. As an alternative, they had unhooked and rerouoted vacuum lines, breaking a tube off the controls under the right side of the dash. They told me that they would have to remove my glove box each spring and fall and reconnect the vacuum lines to change the airflow from floor to dash and vise versa. My fix was to run the lines under the dash just beneath the ash tray and connect shut off valves to the vacuum lines. Now when I need to use the AC I can change the flow of the vacuum by simply turning these two valves so that the flow changes from floor to dash or back. I know this is pretty jack leg but the damage had been done and this has actually worked pretty good.

oneStan

• 617 Answers
• Posted on Mar 29, 2012

SOURCE: 03 buick century, ac control knob blows out on all vents regardless where I position it. David

This usually is related to the vacuum reservior tank/cannister or the hose leading to that chamber. Any other vacuum hose leak could cause a similar problem depending upon it's location.

The hose leading to the cannister is usually just a thin single hose/tube leading to the cannister. The system allows vacuum to build up in the vehicle and maintains vacuum on the A/C system under heavy acceleration where a loss of vacuum would cause the A/C to change operation (switching from defrost to other venting and vice-versa) due to the loss.

You could have a cracked vacuum hose, or a cracked cannister.

You can use regular carburetor cleaner in a spray can with a nozzle, and carefully spray the vacuum lines on your vehicle when idling, and should notice a change in RPMs if you spray near a leak. Only spray a small amount at a time and let the engine compartment air out between spraying/testing since this is a flammable product.

This should lead you to identify any leaks.

Good luck!