A/C BLOWS FROM CENTER VENTS

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MY A/C IS BLOWING NICE AND COOL FROM THE CENTER VENTS BUT THE TWO FAR VENTS BLOW HEAT AS WELL AS THE DEFROSTER OR FLOOR OPTION WHEN SELECTED..THIS ALL STARTED HAPPENING WHEN A A/C HOSE NEEDED TO BE REPLACED AFTER A BELT FAILED AND BROKE IT. THE UNIT IS ALMOST NEW AND IT DOES SEEM TO BLOW NICE AND COOL FROM THE CENTER VENTS..ALL THOUGH IT DOES NOT BLOW STRONG..AND NEVER DID CAN SOMEONE PLEASE GIVE ME AN IDEA WERE TO LOOK