heater core on 1999 Dodge Ram 1500

how to replace heater core

by in Williamston, NC on December 04, 2010
1 answer
ANSWER by on December 14, 2010
The heater-A/C housing assembly must be removed from the vehicle and disassembled for service access of the heater core, evaporator coil, and each of the various mode control doors. WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, Refer to PASSIVE RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY. REMOVAL 1.Disconnect and isolate the battery negative cable. 2.Remove the instrument panel from the vehicle. . 3.If the vehicle is not equipped with air conditioning, go to step 6. If the vehicle is equipped with air conditioning, recover the refrigerant from the refrigerant system. 4.Disconnect the liquid line refrigerant line fitting from the evaporator inlet tube. Install plugs in, or tape over all of the opened refrigerant line fittings. 5.Remove the accumulator.. Install plugs in, or tape over all of the opened refrigerant line fittings. 6.Drain the engine cooling system. 7.Disconnect the heater hoses from the heater core tubes. . Install plugs in, or tape over the opened heater core tubes. 8.Remove the Powertrain Control Module (PCM) from the dash panel and set it aside, but do not unplug the PCM wire harness connectors. 9.Remove the nuts from the heater-A/C housing mounting studs on the engine compartment side of the dash panel. 10.Remove the nuts that secure the heater-A/C housing to the mounting studs on the passenger compartment side of the dash panel 11.Pull the heater-A/C housing rearward far enough for the mounting studs and the evaporator condensate drain tube to clear the dash panel holes. 12.Remove the heater-A/C housing from the vehicle. DISASSEMBLY 1.Place the heater-A/C housing upside down on a work bench. 2.Remove the screw that secures the floor duct to the bottom of the heater-A/C housing and slide the floor duct off of the center heat duct adaptor. 3.Unsnap the center heat duct adaptor from the bottom of the heater-A/C housing and remove the screw that was hidden by the adaptor. 4.Remove the remaining screws on the bottom of the heater-A/C housing that secure the two housing halves together. 5.Place the heater-A/C housing right side up on the work bench. 6.Separate the top half of the heater-A/C housing from the bottom half and set it aside.
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