K 1500 Yukon XL 4WD V8-5.3L VIN T (2001)
21. Remove the heater core clamp.
22. Remove the heater core from the module.
23. Carefully remove the gasket between the rear HVAC module and the air distributor duct. This gasket will be re-used if possible.
24. Remove the fasteners and separate the front case halt from the back half.
25. Remove the evaporator core from the back case half.
26. Inspect the gaskets and the seals for damage.
27. Replace the gaskets and the seals, as needed.
INSTALLATION PROCEDURE
