(!) heat went out on drivers side only. flushed coolant system and back flushed heater core. Heat started working again. one week later heat stopped again on drivers side. Any suggestions ???

(2) V6 engine started misfiring on 4 cylinders per code. Changed all spark plugs and fixed that , but now have an intermittent rough idle that seems to be getting a little worse each day. noticed tonight that when the idle gets rough , interior lights dim slightly ! Any suggestions are appreciated !

 

(1) sounds like a bad actuator.

(2) sounds like something's cutting in and reducing power to the accessories, but I've no idea what.