How do you change the evaporator core on a 1998 Chevy truck?

Answer 1

Evaporator/Heater Core Case

Remove or Disconnect

1. Negative battery cable.
2. Engine coolant.
3. Recover refrigerant.
4. instrument panel.
5. Electrical connectors, as necessary.
6. Center floor air distribution duct.
7. PCM and mounting tray (diesel engines only).
8. Hinge pillar trim panels.
9. Blower motor cover.
10. Blower motor (60).
11. Steering column.
12. tilt back instrument panel assembly.
13. Coolant recovery reservoir.
14. Heater hoses.
15. Evaporator tube.
16. Accumulator.
17. Screws (52 and 64).
18. Nut (50).
19. Screw (56).
20. Module assembly (57).

• May be necessary to have an assistant when removing module assembly.

1. Evaporator case bottom cover plate (63).

• Remove the seven screws that hold the cover plate to the module assembly.

1. Heater core and seal from module assembly.
2. Evaporator case cover (61).

• Remove the four screws that hold the case cover to the module assembly.

1. Evaporator core.

Install or Connect

1. Evaporator core.
2. Evaporator case cover (61).

• Install the four screws that hold the case cover to the module assembly.

1. Heater core and seal into module assembly.
2. Evaporator case bottom cover plate (63).

• Install the seven screws that hold the cover plate to the module assembly.

1. Module assembly (57).

• May be necessary to have an assistant when installing module assembly.

1. Screw (56).
2. Nut (50).
3. Screws (52 and 64).

Tighten

• Screw (56) to 11 N.m (97 lb in) .
• Nut (50) to 2.8 N.m (25 lb in) .
• Screws (52 and 64) to 1.9 N.m (17 lb in) .

1. Accumulator.
2. Evaporator tube.
3. Heater hoses.
4. Coolant recovery reservoir.
5. Instrument panel.
6. Steering column.
7. Blower motor (60).
8. Blower motor cover.
9. Hinge pillar trim panels.
10. PCM and mounting tray.
11. Center floor air distribution duct.
12. Electrical connectors, as necessary.
13. Engine coolant.
14. Negative battery cable.
15. Charge system.
16. Check system for leaks.