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Is the compressor running ?
You may need to replace your Thermostat or your Heater Core.
MAKE sure that is the problem.If heater is blowing cold air,reach on passenger side,under dash,and find the heater blower,and gently pull the white plastic piece to make sure it is not stuck on cold.They go from hot to cold easily but not back to heat.
Because you are low on Coolant
First check your antifreeze level, if the level is fine check to see if the thermostat is operating correctly.
you are low on coolingliquid !
it means that i dont know go ask the dealership The fan belt might be broken.
Purg The Air Out of the Cooling system
it has a dead raccoon stuck in it
The RR button when on makes hot air come out the right rear heat vent, or the rear seat passengers heat and no left rear heat vent exists. This should only be turned on for heat because when the air conditioner is used the air automatically comes out all the ceiling vents.
The HTR RR switch in a Kia Sedona determines which air vents the air is blown through from the rear heating. When it is pushed in, the lower vents blow hot air, and when it is not pushed, the roof vents blow cold air.
You need to buy a cold air intake for your car. It replaces the stock air intake.(the box your air filter is in!)