2005 Kia Sportage - A/C and/or heater quit blowing air

Look at the low-pressure line and see if has condensation...if you don't see condensation it could be low in refrigerant...make sure the compressor is turning on first

No, should not affect the power windows. Something else made them stop working. If no windows work at all, could be a fuse for them is bad. If fuse is good (some vehicles use a circuit breaker rather than a fuse), then you need to start testing at the master power window switch, which is the window switch on the driver's door.

There may be a cabin filter, but you should still hear the blower running even if the filter is clogged.
A mechanic would check for voltage and ground at the blower motor when it does not work.

the A/C system can have many problems first check at the compressor. look to see if when the air is on that the clutch on the compressor is spinning. if it is not try adding some refrigerant to the low side inlet. i would use the kind with the dye in it. if the system is completely empty you may need to put two cans in just to get the compressor to kick on. if you have two cans in and the compressor clutch is not spinning then you compressor is shot and will need to be replaced. if it is spinning it should be blowing cold. look for leaks in the lines leaks will be identified by the dye glowing usually green if no leaks are found you may have just lost refrigerant from normal usage. if that is the case add another can to top it off and enjoy. hope this helps '

What you are most likely hearing is the compressor kicking on/off. The constant kicking could be a sign that there's insufficient refrigerant to keep the compressor running continuously without shutting on/off. Eventually, the compressor won't kick on at all, a safety feature designed to prevent doing damage to a compressor that's undercharged. Have the AC system checked.

the clutch on the air compressor coil is proably burnt out. disconnect electrical plug at end of air compressor and supply current direct from battery to see if clutch engages, if it does not, change thecoil clutch switch.

air con will not engage if gas is low. it is for safety to protect the pump.

could be your air blend door. It rotates between the heater core and the a/c evaporator to mix air. Temp knob or blend door motor is bad.

Does the blower work when you turn off the A/C? If not, it sounds like either the blower motor, relay or blower switch took a poo! 06 Kia? Should still be under warranty.