CHEVROLET MONTE CARLO HEATER NOT WORKING

Hi, I Have A Question Regarding My Air Conditioning. My Car Have A Dual Climate Control System To Operate Between The Driver And The...

I Turn On My Heater On 1999 Monte Carlo, And Blows Out Cold Air

Heater Blows Good Air From A/c Ducks On Right Side (cool) Not Hot, No Air From Left Side Good Air Flow From Heater And Defroster But Cool...