2001 deville , no dash air ?

Hi ,
I purchased a 2001 Deville last month and everything seemed to work just fine until I turned the a/c on the other day and a ticking noise is coming from the middle of the dash and then the blower motor kicked on and I only get air from the floor vents and the defrost vents but not from the dash vents . I took the car to firestone and they said I need a new blower motor for 580.00 Dollars . The blower motor seems to be working fine , I can hear it kick on and it blows out air strong from the floor vents and defrost vents but not from the dash vents . Does anyone know what else it could be ? or does it sound like I need a new blower motor ? Any answers would be greatly appreciated . Thans

it me it sounds like physical blockage in the vents, or a problem with the blower motor.

"Problem With Blower" - Whenever air barely blows out the
vents, the blower (a.k.a. "fan") is always a prime suspect.
In particular, the blower motor may be failing or the blower
wheel may be slipping from the blower motor shaft. Another
possibility is that the blower will only operate at it's lowest
speed, regardless of which setting it's on. For example,
even when the blower/fan is on its highest setting, it sounds
like it's on its lowest setting. This is caused by a faulty
dashboard blower/fan switch assembly (specifically, loose
wires or bad resistors).
"Physical Blockage Of Ducts" - Obviously, if the ducts are
blocked, air flow will be restricted. One possibility involves
a heavy accumulation of leaves in the fresh-air intake port.
However, this will only affect air output when the system is
set to "fresh". The other possibility is that one or more of
the air doors (inside the ducts) is stuck in a closed or nearly
closed position, thus restricting air flow.

First, check the fresh-air intake port for leaves/debris which
may be blocking it. This port is located on the outside of
the vehicle near the base of the windshield... you may have
to open the hood to get full access to it. As was mentioned
in the explanation for this diagnosis, blockage of this port
will only affect the system when it's set to "fresh". However,
if air barely blows out the vents even when the system is set
to "recirculate", you've got a more serious situation than that
of a simple leaves/debris buildup. In this case, you'll need
to take this vehicle to a mechanic who has some expertise
in the area of auto A/C and heater systems. Unfortunately,
the mechanic will (in most cases) need to tear apart the
dashboard in order to get at the blower and the various ducts
of the system. Good luck.

hope this helps

Terrell