Here is a typical schematic of the 2009 Chevrolet Silverado 2500 Evaporator and Heater Parts Diagram. The heater and evaporator system consists of parts and components as follows:
1) Evaporator core
2) Evaporator core Seal
3) Evaporator case Upper
4) Evaporator case Lower
5) Heat shield
6) Seal kit
7) Heater core
8) Heater case
9) Blower motor
10) Fan
11) Resistor
12) Blower case
13) Blower case Seal
14) Valve Air inlet
15) Valve Mode
16) Temperature Temperature Right
17) Temperature Temperature Left
18) Valve Defroster
19) Actuator Air inlet
20) Actuator Mode
21) Actuator Temperature
22) Lever Mode
23) Harness