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I have a 2011 touareg. Heat blows cold sometimes and hot sometimes. When it's working, at idle it's warm and with acceleration it's hot. I replaced the heater control valve coolant level is good and the temperature gage shows about 200° with no flux. Any ideas of what to try. It was throwing a code for auxiliary water pump which I'm assuming is also called heater control valve which is now new.
 
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