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Q: heater problem on 2002 Audi A4 Quattro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my audi a4 temp gauge is getting to normal range but the heater never gets hot no matter what the temp is set at in the car i know it could only be a few things but was hoping to narrow it down.
is the coolant low? do the hoses to the heater core get hot? if not, could be a flow problem. ever put stop leak crap in, could be plugged. have coolant work done recently, could be air bound. the temp flap motor should be checked using a diagnostic tester to make sure the flaps go to the "hot" setting.
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