Water Dispenser Not Working

I would like to begin by thanking Appliance Parts Pros for allowing me to be a member of this forum. I have a side by side Whirlpool Modle GD22DQ. I replaced the water valve on my refridgerator. I have water to the coupler behind the grate at bottom of fridge. I do not have water coming out the water dispenser. My Ice maker is working fine. I can only assume that the water line going up the fridge door is plugged. How am I able to get access to my waterline? Or is there another problem that I may be missing?
I thank you in advance;
Improved_1