hey guys just got my 95 deville 4.9 going again atill have a no heat issue.the floor blows out and defrost but both cold.but nothing comes out of the main vents ac or heat.i just replaced the thermostat and tried to blow out the heater core.just wondering if anyone has had the same issue,wondering if its an issue with a blend door,if so if i can get a location of where they are and a process of what to do,or if there are other options i shoild try 1st.also i checked the plastic t between the thermostat and heater hoses,heard there was a restrictor on it but mine looks open on all 3 sides.thanks