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Iv`e done a coolant change on my Tiguan and my heater now is playing up. I`m not sure if it happened since coolant change , or possibly been like this prior. My heater works perfectly on high heat setting, but turned down just one click to 29.5 or lower, it stops blowing heat. At one time it was producing some reduced heat at 26 - 29.5 , but not now. I have run the system with tank lid off with engine hot , heater flat out , for extended period to bleed the system, but heater still not operating properly. Car temp sitting perfect on extened drive . I have done the climatronic re- calibration a number of times with little success. I can only suspect air mix flaps are faulty, as at full heat the sound is distinct compared to turning it down only one or two cicks to 29, the sound has a distinctly different sound like it it shutting off heat mode completely ,which it is literally doing. Any ideas on this problem?
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