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What is your question?
I’m 99% sure I’ve diagnosed the problem. Just need to find the resistor to replace it! Blower changes speed spontaneously, or cuts out sometimes. When blower runs, heat or AC flow as expected. Often, fan will change with auto stop—goes to lower speed then stays there, for example, or comes on after not running. Blower is smooth and noise-free when it runs.
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I am sorry to say that I cannot find a location of the blower motor resistor in the workshop manual for the Volkswagen Tiguan. As a result, it makes me think that it could be part of an assembly instead of an individual component. I would suggest guidance at a local shop near you: https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.