Hello. I need help with my 2011 dodge nitro shock 4.0. The heat works , but when I change the heat from defrost to vents it switches just fine ,but when I switch it to floor it stays on defrost and vents. Is this an easy fix? I’m no expert but I’m very handy at fixing things myself. Please help. If it’s an actuator where is it located? Is there more then one actuator for these as well?