Hello -

I have a 1999 Toyota Camry LE (4 cyl) and recently noticed that when I
turn on the air (hot or cold), unless the knob is in slot 3 or 4, there
is no air coming out of the vents.

Does anyone have any suggestions on what could be wrong.

Thanks in advance.

bad switch

I mean the switch you need to put on 3-4 is bad

Thanks for responding. Does it cost a lot to replace the switch or is
it fairly inexpensive ?

More likely the resistors.
Search this group for "fan resistor" and you should find what you need.

no it isn't the switch or anything else. It's quite common with
Toyotas. Classic sign of a bad
BLOWER MOTOR RESISTOR. Costs at the most $50.00 and is quite easy to
install. It's on the side of the blower motor which is under the
passanger side dash. Two screws it's out and plug in and fasten those
screws