So since I swapped a 2.4 in my 88 New Yorker Turbo, I have been having issues with my heating/air conditioning. Before the AC was charged, I would have the heater control all the way to cool and it would still blow in some heat. Now with the AC charged, the AC works great until the engine is warmed up and then it no longer blows cold. During the 2.4 swap, I got rid of the heater control valve under the hood. Could this be the reason why? Or is the issue in the HVAC assembly?