QuestionI've recently purchased a '02 dodge 3500 dually with the 5.9L. We had changed the lift pump, injector pump, and theirs a flap on the turbo that isn't working(still trying to fix that) But the major problem my dad and i have is trying to find the blend door. The heat is on all the way and it is blowing cold air like it's on A/C. Where is it, and how do you get to it(blend door)? Thanks
AnswerREMOVAL
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in an accidental airbag deployment, possible personal injury or death.
NOTE: Vehicles equiped with single zone HVAC systems have one blend door, dual zone systems have two blend doors.
Remove the HVAC housing from the vehicle (Refer to 24 - HEATING & AIR CONDITIONING/DISTRIBUTION/HVAC HOUSING - REMOVAL).
Disassemble the HVAC housing (Refer to 24 - HEATING & AIR CONDITIONING/DISTRIBUTION/HVAC HOUSING - DISASSEMBLY).
Remove the levers from the driver and/or passenger side blend door (if equipped) (Blend Door - Dual Zone Shown, Single Zone Typical).
Gently slide the drivers and/or passenger side blend door toward the out side of the housing. Tilt and lift the door(s) out of the housing.
Inspect the blend door(s), seals and the HVAC housing for damage or binding and repair or replace components as required.
REMOVAL
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in an accidental airbag deployment, possible personal injury or death.
WARNING: Refer to the applicable warnings and cautions for this system before performing the following operation (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - WARNINGS) and (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - CAUTIONS). Failure to follow the warnings and cautions could result in possible personal injury or death.
NOTE: The HVAC housing must be removed from the vehicle and the two halves of the housing separated for service access of the heater core, evaporator coil, defrost door, blend door(s) and the recirculation door.
Disconnect and isolate the battery negative cable.
Drain the engine cooling system (Refer to 7 - COOLING - STANDARD PROCEDURE).
Recover the refrigerant from the refrigerant system (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD PROCEDURE - REFRIGERANT RECOVERY).
Disconnect the liquid refrigerant line fitting from the evaporator inlet tube (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING/REFRIGERANT LINE COUPLER - REMOVAL). Discard the O-ring seal and install plugs in, or tape over the opened liquid refrigerant line fitting and evaporator inlet tube.
Remove the accumulator (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING/ACCUMULATOR - REMOVAL). Discard the O-ring seals and install plugs in, or tape over the opened refrigerant line fittings and evaporator outlet tube.
Disconnect the heater hoses from the heater core tubes. Install plugs in, or tape over the opened heater core tubes.
Remove the powertrain control module (PCM) from the engine compartment to gain access to the HVAC housing retaining nuts (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL).
Remove the two nuts from the HVAC housing mounting studs in the engine compartment.
Remove the instrument panel from the vehicle (Refer to 23 - BODY/INSTRUMENT PANEL - REMOVAL).
Remove the bolt that secures the HVAC housing to the floor bracket located in the center of the vehicle (HVAC Housing - Dual Zone Shown, Single Zone Typical).
Remove the two nuts from the HVAC housing mounting studs in the passenger compartment.
Remove the HVAC housing from inside the vehicle. Take care not to allow any remaining coolant to drain onto the vehicles interior
