I have a 2006 tdi with 200k. Heat stopped working last week. So far I've replaced the t stat. Flushed the heater core. And checked the auxiliary heater. The heater is getting 14 volts I'm not sure if that means it's working or not. I can see the arm on the blend door move when I turn the handle. No foam coming out of the vents. New cabin air filter. Fan blows good. Thermostat reads 180. All the hoses in the engine bay get hot to the touch so I don't think it's the water pump. Any suggestions?