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Here is the service info for actuator replacement.
Mode Valve Actuator Replacement
Important: The left air temperature actuator does not need to be removed in order to remove the mode actuator.
The mode door levers must be in the same position in order to reassemble the mode actuator to the HVAC case.
Notice: Refer to Fastener Notice in the Preface section.
Tighten Tighten the screws to 1.4 N·m (12 lb in).
how do i remove the dashboard?
Here is the info for removing the dash.This is a big job.
Instrument Panel Assembly Replacement Removal Procedure
Caution: Refer to SIR Caution in the Preface section.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the I/P carrier nuts and bolts to 25 N·m (18 lb ft).
Tighten Tighten the I/P carrier to cowl nuts to 25 N·m (18 lb ft).
Tighten Tighten the I/P center support bracket bolts to 25 N·m (18 lb ft).
need help on a 1999 Chevy K3500 pickup with a 7.4 L