FIRST KNOB WAS HARD TO MOVE BUT AFTER STUCK AND BROKEN AND USING WITHOUT AC.
2003 LANCER HEAT CONTROL KNOB BROKEN,IS MISTSUBISHI REPLACE IT FREE ? on 2003 Mitsubishi Lancer
This is a known issue. It's like a 15$ part new and 10 minute job. You can get the part from a 2004+ lancer, alternatively.
no out of warranty