Page 1 of 6 Service Manual: HEATING & AIR CONDITIONING - Print Date: SERVICE INFORMATION - 2500 HD & 3500 HD DISTRIBUTION > HOUSING, HVAC > INSTALLATION > AIR INLET HOUSING Fig 1: Front Of Air Inlet Housing 2014 RAM 2500 HD 6.4L Eng SLT If the foam seal on the air inlet housing is deformed or damaged, it must be replaced. 1. Position the air inlet housing (1) onto the top of the HVAC housing (2). 2. Engage the two retaining tabs (3) that secure the front of the air inlet housing to the HVAC housing.
Page 2 of 6 Fig 2: Air Inlet Housing 3. Engage the two retaining tabs (4) that secure the rear of the air inlet housing (3) to the HVAC housing (5). 4. Connect the HVAC wire harness (1) to the recirculation door actuator (2). 5. Install the HVAC housing assembly. Refer to HOUSING, HVAC, INSTALLATION. DISTRIBUTION > HOUSING, HVAC > INSTALLATION > HVAC HOUSING ASSEMBLY CAUTION: Be certain to adjust the refrigerant oil level when servicing the A/C refrigerant system. 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.
Page 3 of 6 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. 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. 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.
Page 4 of 6 Fig 1: HVAC Housing To Floor Bracket Nuts 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. 5. Install the instrument panel assembly. Refer to PANEL, INSTRUMENT, INSTALLATION. 6. If equipped with center floor console, install the floor console duct. Refer to DUCT, FLOOR CONSOLE, INSTALLATION.
Page 5 of 6 Fig 2: HVAC Housing Engine Compartment Side Nuts & Studs 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 or MODULE, POWERTRAIN CONTROL, 6.7L DIESEL, INSTALLATION. 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. 11. Reconnect the negative battery cable. 12. If the heater core is being replaced, flush the cooling system. Refer to STANDARD PROCEDURE. 13. Refill the engine cooling system. Refer to STANDARD PROCEDURE. 14. Evacuate the refrigerant system. Refer to PLUMBING, STANDARD PROCEDURE.
Page 6 of 6 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. 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. 17. Initiate the Actuator Calibration function using a scan tool. Refer to STANDARD PROCEDURE.