How do I reset the hvac system

ID Status Date Year Make Model Transmission Type A/C Controls Public/Private
#14700 In Progress 2003 Gmc Envoy public

Just bought a 2003 GMC envoy withe the automatic controls guy told me heat and ac worked fine until he changed the battery he was told he needed to reset the hvac system right now it just blows out the defrost on driver and passenger doors and windshield the driver side blows cold passenger side blows hot none of my fuses are marked all videos I watch say to pull the hvac fuse none of my fuses say hvac on them any info would help

Sparky

The HVAC B fuse is in the rear fuse box under the driver’s side rear seat.

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