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its hard job if first time doing mechanic work.problem could be the temperature control switch also.to get to the air door actutor you have to remove instrument panel cluster and remove lower right sound insulator and lower left sound insulator panel and knee bolster from below the steering column.first you need to disable airbag in the steering wheel and passenger side dash before working around the dash area.to disable airbags turn off radio disconnect negative battery cable wait 20 minutes let airbag discharge first before attempting to work around the dash or instrument cluster. like i said hard job if first time you have remove a lot of things to get to the heater core housing where air door actutor and defrost actutator locations.
Make sure the DIMMER Switch on the left of the dashboard was not turned OFF inadvertently, it happens a lot while wiping the board clean, if OK, check the INST. LIGHTS 10A fuse located on the passenger side under dashboard.
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i do not know unless the plug on the back of the cluster is loose give these websites a try www.alldatadiy.com and www.autozone.com you may also want to give these guys a call they only sells GM parts only its Schram auto & truck parts 1-800-292-1032 and they website is www.schramauto.com wish you the best of luck Michigan Man.