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

Air stuck blowing from floor and defrost only

Asked by for the 1999 GMC Sierra 1500
POSS BLEND DOOR ACTUATOR ISSUES
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.
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.
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