We have added freon and think that the hi or lo switch may have gone out. It blows, but not cool air.
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.
heat core. leak. thermostat. no antifreeze.
It doesn't really blow it out it just warms the cold air.
One of the temp blend door actuators is bad.
There is a divertor controller under the dash that controls between heat and cold. Sometime the wireing harness works loose.
Check the engine coolant level. My 2004 would blow cold at a stop light, then warm by the next light. The top radiator hose was leaking causing the level to be low.
No! Thermostat.
Check the colant level, it may be low.
you would need to add freon
Could be a bad thermostat.
One of the reasons a 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold might be that there is a problem with the hot/cold duct. The air or a vent might be inadvertently blowing periodically.
She was Sandra Brennan.