AC only blows on speeds 1-3. Replaced blower motor and resistor. Is it the temperature control unit?

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2011Jetta 2.5SE. Manual AC. Replaced blower motor and resistor and unit still only blows on speeds 1-3. Is it the temp control unit that’s at fault? (Unit that is on dash where you change blower speed and temp manually) Please advise.

How long has your 2011 Volkswagen Jetta had this problem?

2weeks