This is a big ugly job. I recommend using a shop manual to assist with the job. First disconnect the battery, then drain the coolant. Next you will need to remove the dashboard (instrument panel). There are several mounting points on top (3), sides (2) and around the centre (6 or 9), glovebox (4). You will aslo need to remove the steering wheel, drop the panel underneath the steering column, remove the vent cross tube, then drop the column (held in place with 4 nuts). The instrument cluster needs to be removed (5 screws hold the facia or trim bezel); rememebr to disconnect the speedometer cable). Also, disconnect the heater control cables from the heater box control arms (they should snap out). Once the complete dashboard has been removed you now have access to the heater box. Disconnect the heater hoses from the heater pipes underneath the hood. If the hoses have never been done before, you may have to cut the hoses off, as the rubber may have bonded to the brass tubes. The heater box is bolted to the firewall with 4 bolts. Once the bolts are unscrewed you should be able to pull the heater box out. The box is held together with U shaped spring clips that can be pried off. The temeprature control valve is located on the left side of the box and should be removed prior to taking the box apart. The heater core can then be slid out of the heater box and repaired or replaced as required. You need at least 5 hours for the removal and 6 hours for the re-installation. Good luck! Malcolm
# Disconnect the negative battery cable. # Drain the engine coolant. # Remove the instrument panel/dash assembly from the vehicle. # Remove the heater hose(s) and cap the hose(s). # Remove the attaching nuts and remove the heater unit assembly. # Remove the heater core attaching screw and remove the heater core..............
After you remove the hoses from the core, remove the nuts and bolts that secure the heater case to the firewall in the engine bay. Inside the cab you will have to remove the glove box assembly for clearance. then disconnect the blower fan wiring. there may be another bolt securing the heater case to the firewall on the inside of the cab. Then you should be able to remove the heater case. You'll have to split the heater case to get to the core.
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