Hi. I have a issue that has me scratching my head. I have a 2011 CC with the 2.0 turbo. The Temperature blend door is work and the Zone selection is working as well...just the heat is barely warm The AC works well and the blend door is moving freely and will only allow the air to barely get warm if at all. Coolant is topped up and I have a pdf manual, but I'm not finding information on a water control valve or what allows hot water to flow through the core. Is there a hot water control valve in this system? Stuck thermostat? Not running hot and gets up to 190* within a couple minutes of driving and doesn't overheat. My thermostat neck is leaking some so I'll fix that, but I don't think I have a actual thermostat problem, but any info will be great. Thank you