Dropped $140 on a coolant flush kit and my heater still blows cold
So I grabbed a $140 coolant flush kit from the parts store down on 5th last month because my truck was running hot on the highway, and now the temp gauge sits fine but my heater blows straight cold air in the morning. I followed the funnel burp method twice in my driveway and even parked on a slope like some forum guy said, but nothing. Did I just trap a huge air bubble somewhere, or did I cook my heater core without knowing it?