1999 GMC Sierra 1500 Q&A

1999 GMC Sierra 1500 Question: Turned on heater to blow on floor and heard a pop. Now air blows from floor only

Air stuck blowing from floor and defrost only -
Answer 1
POSS BLEND DOOR ACTUATOR ISSUES -
Comment 1
thanks for the direction to start . could you tell me where blend door is located. Have not been under a dash in 20 yrs. Im a fork lift mechanic now. -
Comment 2
there are 3 blend doors rt, left and middle. 1 is by gas pedal one is center of dash amd pne is under glove box area. -