If switching sensors did not have any effect, then sensors themselves are OK, fault must be in the wiring or climate control unit. If it reads 35 C already it makes sense that it thinks it is already too hot so it's blowing cool air instead of hot but if you switch to max temperature it should be providing warm air.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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