1996 Audi A6 Quattro Q&A

1996 Audi A6 Quattro Question: heater is putting out very little heat on high position or any position

drove into town heater worked fine, on the way back home it put out very little warm air, all the heater controls work fine but very little heat -
Answer 1
check your coolant level if ok replace thermostat its the cheapest place to start -
Answer 2
ck coolant level you may have a leak you haven't noticed -