PLEASE HELP...Heater Problem

I have a 2003 Dodge Ram Quad Cab 1500 series with the 4.7 motor. It has developed a problem where the heat blows warm out of the
vents on the right side of the radio. The vents on the left are just blowing cool air. This is also the same problem with the heater...right side warm left side cool. The defroster works okay. It is not blowing hot.just warm. Please e-mail me ANY suggestions, since I cannot afford to take it to a dealer.
I posted this on a friends computer so please e-mail
Thanks, Barbara
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