Hello all, ive searched for answers and decided to make my post… My s6 heat works great at low rpm and cruising around the b-roads but as soon as i get into the rpms ~2300 rpm the heat changes to blowing cool/cold air. I recently did a coolant drain and fill…could it be air? Ive taken apart the heater control valve and cleaned it…could it be acting up? No codes when i scanned it with the vagcom. Any ideas are welcome!
