I have no air coming out the front vents of a 2003 suburban the fuses looked fine. What else could there be and if it is a blower, how do you replace it?

they usually just need levering out , get a piece of cloth or similar to protect the dash then work around vent with a mid size flat blade screwdriver and out it comes

remove the radio and find the vacuum hoses / wires to the vent controls/module that have become dislodged during the radio fitment.

You may have accidently disconnected something.

Could be the blower motor, or a restriction in the heater box, or a blend door problem.

You have either a blend door problem,or the blend door actuator. Both are located underneath the dash.

if its the computer climate controlled series then it might be the the vents. what happenes some times is the vent wont switch over from hot to cold or vise-versa. i had the same problem but reversed, no heat in front and it worked up to the last time i had switched it from hot to cold.
give it a shot, best of luck

they might a relay for them,thats gone bad,, hope this help

Try looking under the drivers side passenger seat.

The car uses the same freon in the front as it does in the rear. If the rear a/c is working, you either have a plugged evaporator in the front unit, or perhaps a bad heater switch. Try switching the heater to hot and see if it blows even warmer air from the front vents. If so, the heater switch is working and then it sounds like a plugged evaporator or maybe a plugged orifice tube. That is a good place to start looking. Hope this helps.

check for vacuum leak under hood on passegers side ,replace vacuum tubing even if it looks ok could be pinched or pin hole u cant see vacuum going from eng compartment to inside firewall