how to remove HVAC box?

[alex]

1993 GMC sierra 4.3

i need to replace my evaporator core because it leaks. i rather not remove my entire dash for the job but will if i need to. does anyone have any info they could give me on if i am able to just remove the HVAC box without removing the dash?

Topic

[David]

have fun. job pays 3.2 hr. from prodemand
Disconnect negative battery cable. Discharge A/C system using approved refrigerant recovery/recycling equipment. Drain engine coolant. Remove glove box. Disconnect electrical connectors if necessary. Remove floor air distribution duct.
Remove Electronic Control Module (ECM) and mounting tray. Remove trim panels. Remove blower motor cover. Remove blower motor-to-case screws, and remove blower motor. Loosen steering column bolts from instrument panel. Remove carrier and body bracket bolts supporting instrument panel (located on firewall and at each end of instrument panel).
Tilt back instrument panel assembly. Remove coolant recovery tank. Remove heater hoses at heater core. Disconnect inlet and outlet lines at evaporator core, and cap openings. Remove accumulator. See ACCUMULATOR under REMOVAL & INSTALLATION . Remove A/C-heater assembly-to-firewall screws and bolts. Remove A/C-heater assembly from vehicle.
Remove heater core cover from A/C-heater assembly. Remove heater core and seal from A/C-heater assembly. Remove air distribution lower case, and remove evaporator core from A/C-heater assembly. See Figure.
To install, reverse removal procedure. Add 3 ounces of clean refrigerant oil to evaporator. Lubricate NEW “O” rings with clean refrigerant oil prior to installation. Fill cooling system, and check for leaks. Evacuate, recharge and leak test A/C system.

[Billy]

Man, that sounds like a bunch more than a 3-hour job.

[Author]

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