What could cause this problem? on 2002 Chrysler Sebring

I sometime get cold air instead of heat coming out of the vents.I replaced the thermostat last year, just flushed the radiator and filled with new antifreeze. Sometime warm air might come out of 2 vents and cold out of the remaining vents.

by in Addyston, OH on December 06, 2013
1 answer 2 comments
ANSWER by , December 06, 2013
Do you have dual heating controls? Double check the coolant level, make sure it is full.
COMMENT by , December 11, 2013
Plenty of antifreeze. It has Temparture control and a heat, defrost, ac control.
COMMENT by , December 11, 2013
Guess yours is not automatic with dual zone heat; Sounds like the temp/blend door actuator is malfunctioning.