Kia Troubleshooting Questions? Ask a Mechanic
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This can be an issue with a restricted heater core.I have seen the heater core restrict in the past before and cause hot or warm air from one or more vents closest to the heater core and cooler air from the rest.What needs to be done from here is to run the engine until warmed up and turn on the heater and locate the coolant heater hoses leading from the engine to the firewall at the heater core.Touch these hoses.They should both be very warm to hot to the touch and the same temp.If you have one that is hot and one that is allot cooler then the heater core is restricted needing back flushed to correct this here or replaced.
If both of these are found to be o.k. this can be a fault with a temp actuator on the heater box needing replaced.You would have to have this tested further electronically to see if a temp actuator needs replaced.This would require a compatible scan tool in some cases as well as a multi meter to test this.
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