No water coming out of my Kohler Forte R10275-4-BN...

Question

Hello I need help on a Kohler Forte R10275-4-BN shower valve I had installed but NO water comes out of the shower nozzle when I turn the handle to cold (my hot is not connected yet). This model is for a shower only no opening at the bottom for a bath tub. Both brass valve stops are open (one for hot one for cold coming in from the sides) to allow water to come into the central valve, I know this because I took out the center plastic cluster of the main Kohler vale (the part that would turn with the decorative handle) and water comes out.