You probably have a jammed or otherwise defective vent door.
The vacuum supply line from the engine is disconnected or broken. When the vacuum supply is cut off the system defaults to the defrost mode.
I have exactly the same problem on my 2000 Still looking for the answer
This is very common on many vehicles and its either a broken, cracked or removed vacuum line.......
Air conditioner drain line stopped up or windshield seal leak that covers 99% of the reasons
Yes, a 4.5 ton air conditioner would be the minimum size for 2000 square feet.
how do you charge the air conditioner on a 2000 neon
You have a vacuum line disconnected probably under the hood. The HVAC controls are operated by vacuum and when there is no vacuum it system goes into defrost mode.
There is not a fuse that controls the air to your vents in your 2000 Toyota. The vents are controlled by blending doors. The doors open and close to direct air to the desired location.
You might need freon
my 1998 gmc jimmy has no floor heat but i have defrost and ven heat
Yes, the ac will run in the defrost position to dry the windshield.
i just replaced the thermostat in 2004 Chevy truck heater works fine now