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Heating & Air Conditioning - Service Information: Overhaul RAM Pickup 2500

A/c Compressor 3 illustrations ~815 words

HVAC HOUSING ASSEMBLY

WARNINGRefer to the applicable warnings Plumbing , Warning and cautions Plumbing , Caution for this system before performing the following operation. Failure to follow these instructions may result in possible serious or fatal injury.
WARNINGDisable the airbag system before attempting any steering wheel, steering column or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (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 follow these instructions may result in accidental airbag deployment and possible serious or fatal injury.

Note. The HVAC housing must be removed from the vehicle for service of the A/C evaporator, heater core, mode-air and blend-air doors and air inlet housing.

Scheme 56

Scheme 56
Scheme 56

Scheme 57

Scheme 57
Scheme 57
  1. Disconnect and isolate the negative battery cable.
  2. Recover the refrigerant from the refrigerant system. Refer to «Plumbing , Standard Procedure»(ref-457787-S01365783702012030200000) .
  3. Drain the engine cooling system. Refer to «Standard Procedure»(ref-457792-S30781673372012030200000) .
  4. Disconnect the A/C liquid line and the A/C suction line from the A/C expansion valve. Refer to «LINE, A/C Liquid , Removal»(ref-457787-S36406991352012030200000) .
  5. Disconnect the heater hoses from the heater core tubes.
  6. If required, remove the Powertrain Control Module (PCM) to gain access to the two nuts (2) that secure the HVAC housing to the engine compartment side of the dash panel. Refer to «MODULE, Powertrain Control , Removal»(ref-457810-S36855600362012030200000) «MODULE, Powertrain Control, 6.7L Diesel [ETJ] , Removal»(ref-457810-S08167358582012030200000) .
  7. Remove the two nuts from the studs (1) that secure the HVAC housing to the engine compartment side of the dash panel.
  8. If equipped with center floor console, remove the floor console duct. Refer to «DUCT, Floor Console , Removal»(ref-457787-S19343168312012030200000) .
  9. Remove the instrument panel from the passenger compartment. Refer to «PANEL, Instrument , Removal»(ref-457777-S33453955062012030200000) .
  10. If equipped, remove the rear floor ducts. Refer to «DUCT, Floor Distribution, Rear , Removal»(ref-457787-S33590643652012030200000) .
  11. Remove the bolt (3) that secures the HVAC housing (2) to the floor bracket.
  12. Remove the two nuts (1) that secure the HVAC housing to the passenger compartment side of the dash panel.
  13. Pull the HVAC housing assembly rearward and remove the housing assembly from the passenger compartment.
CAUTIONBe certain to adjust the refrigerant oil level when servicing the A/C refrigerant system. Refer to OIL, Refrigerant , Standard Procedure . Failure to properly adjust the refrigerant oil level will prevent the A/C system from operating as designed and can cause serious A/C compressor damage.

Note. When replacing multiple A/C system components, refer to OIL, Refrigerant , Standard Procedure to determine how much oil should be added to the refrigerant system.

Note. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the refrigerant system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.

Note. Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line is disconnected. Failure to replace the rubber O-ring seals and metal gaskets could result in a refrigerant system leak.

  1. Position the HVAC housing assembly (2) into the passenger compartment and over the studs on the dash panel, with the condensate drain tube in its proper location.
  2. Install the two nuts (1) that secure the HVAC housing to the passenger compartment side of the dash panel. Tighten the nuts to 6.8 N.m (60 in. lbs.).
  3. Install the bolt (3) that secures the HVAC housing to the floor bracket. Tighten the bolt to 6.8 N.m (60 in. lbs.).
  4. If equipped, install the rear floor ducts. Refer to «DUCT, Floor Distribution, Rear , Installation»(ref-457787-S34446033122012030200000) .
  5. Install the instrument panel assembly. Refer to «PANEL, Instrument , Installation»(ref-457777-S21962648422012030200000) .
  6. If equipped with center floor console, install the floor console duct. Refer to «DUCT, Floor Console , Installation»(ref-457787-S31510819762012030200000) .
  7. Install the two nuts (2) onto the two studs (1) that secure the HVAC housing to the engine compartment side of the dash panel. Tighten the nuts to 6.8 N.m (60 in. lbs.).
  8. If removed, install the powertrain control module (PCM). Refer to «MODULE, Powertrain Control , Installation»(ref-457810-S29494084852012030200000) and «MODULE, Powertrain Control, 6.7L Diesel [ETJ] , Installation»(ref-457810-S07149467772012030200000) .
  9. Connect the heater hoses to the heater core tubes.
  10. Connect the A/C liquid line and the A/C suction line to the A/C expansion valve. Refer to «LINE, A/C Liquid , Installation»(ref-457787-S22954485862012030200000) .
  11. Reconnect the negative battery cable.
  12. If the heater core is being replaced, flush the cooling system. Refer to «Standard Procedure»(ref-457792-S30781673372012030200000) .
  13. Refill the engine cooling system. Refer to «Standard Procedure»(ref-457792-S30781673372012030200000) .
  14. Evacuate the refrigerant system. Refer to «Plumbing , Standard Procedure»(ref-457787-S01365783702012030200000) .
  15. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the refrigerant system. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to «OIL, Refrigerant , Standard Procedure»(ref-457787-S36984087812012030200000) . Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
  16. Charge the refrigerant system. Refer to «Plumbing , Standard Procedure»(ref-457787-S01365783702012030200000) .
  17. Initiate the Actuator Calibration function using a scan tool. Refer to «STANDARD PROCEDURE»(ref-457876-S41951374432012030200000) and «STANDARD PROCEDURE»(ref-457874-S02669228202012030200000) .

Scheme 58

Scheme 58: DESCRIPTION
Scheme 58: DESCRIPTION

The blower motor (1) is used to control the velocity of air moving through the HVAC housing assembly by spinning the blower wheel (2) at the selected or programmed speed (depending on control system application).

The blower motor is a 12-volt, direct current (DC) motor that is mounted within a plastic housing that has integral wire harness connector (3), integral mounting tabs (4) and the squirrel cage-type blower wheel secured to the blower motor shaft. The blower wheel is positioned within the air inlet housing on the passenger side end of the HVAC housing assembly.

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