Why do my air condition blows everywhere except for out of the front vents in my 2001 nissan sentra

SOURCE: Front air condition does not blow cold. Rear air condition does

sounds like a damper door in the front not working properly, these are actuated by the front temp control, the door is operated by either a manual cable, and electric actuator, or vacuum. I hope this helps you zero in on your problem. Merry Christmas

SOURCE: 2005 nissan sentra-air stuck on defrostwont switch to floor or ve

vent door is stuck open

SOURCE: Would like to recharge my air conditioning on my 2001 nissian maxima that has 117,000 on it blows hot air when air conditioning is turned on.

You will need R134a, and a filler hose. Charge the system on the low pressure side, it should have a blue cap on the charge point.
Your filler hose will only fit the low pressure side, just in case the cap has been removed.

SOURCE: 2001 nissan maxima air condition fan not working

If the ac fan is not coming on the ac is inop. the compressor is bypassed. Check fuses and relays first.

SOURCE: My air conditioning is stuck on the vents in my

well if you don't mind hard work,then you must pull out the panel that holds your knob switches and check that the cable has not pulled out from the knob,clip it back into place and you should be fine,otherwise you should take it to a repair shop,good luck