how to replace htr core
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2000 Jeep Wrangler Question: heater core replacement
Answer #1Johnny Mopar October 25, 2010, 18:21Master
Remove the heater-A/C housing : 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, recover the refrigerant from the refrigerant system. 4.Disconnect the liquid line refrigerant line fitting from the evaporator inlet tube. 5.Disconnect the accumulator inlet tube refrigerant line fitting from the evaporator outlet tube. 6.Drain the engine cooling system. 7.Disconnect the heater hoses from the heater core tubes. 8.Unplug the heater-A/C system vacuum supply line connector from the tee fitting near the heater core tubes.
9.Remove the five nuts from the heater-A/C housing mounting studs on the engine compartment side of the dash panel Heater.
10.Remove the cowl plenum drain tube from the heater.
11.Remove the floor duct from the bottom of the heater.-
12.Remove the one screw that secures the heater-A/C housing to the plenum bracket on the passenger compartment side of the dash panel.
13.Pull the heater-A/C housing down far enough to clear the defrost/demist and fresh air ducts, and rearward far enough for the mounting studs and the evaporator condensate drain tube to clear the dash panel holes. 14.Remove the heater-A/C housing from the vehicle.
DISASSEMBLY: 1.Remove the heater-A/C housing from the vehicle and place it on a work bench.
2.Unplug the vacuum harness connectors from the floor door actuator and, if the unit is so equipped, the recirculation air door actuator.
3.Disengage the vacuum harness from any routing clips located on the lower half of the heater-A/C housing.
4.Disengage the heater-A/C wire harness connector and the blower motor relay wire harness connector push-in retainers from their mounting holes on the heater-A/C housing.
5.Remove the blower motor and blower wheel unit from the heater-A/C housing.
6.Carefully remove the foam seal from the flange around the blower motor opening in the heater-A/C housing. If the seal is deformed or damaged, it must be replaced.
7.Pull the vacuum supply line and connector through the foam seal on the heater core and evaporator coil tube mounting flange of the heater-A/C housing Heater- 8.If the unit is equipped with air conditioning, remove the screw that secures the clamp to the evaporator coil tubes and remove the clamp. 9.Carefully remove the foam seal from the heater core and evaporator coil tube mounting flange of the heater. If the seal is deformed or damaged, it must be replaced.
10.Use a screwdriver to pry off the two snap clips that help secure the upper and lower heater-A/C housing halves to each other.
11.Remove the 14 screws that secure the upper and lower heater-A/C housing halves to each other.
12.Carefully separate the upper heater-A/C housing half from the lower half.
Disassemble the heater-A/C housing
Lift the heater core out of the lower half of the heater-A/C housing.