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==== Installing the New Core ==== OE heater cores are expensive and becoming difficult to get a hold of. I used an aftermarket Autozone heater core (part #399386). The heater core is held into the heater core box by a small plastic bracket with two screws in it. Remove these screws and pull out your old core. Be careful, as some coolant may still be in the core. https://dev.z31library.com/xenonzcar_archive/z31/images/Raredare1/Heatercore/hc6s.jpg As you may notice, the two cores may not be exactly the same size. This is because the aftermarket cores are designed to fit other vehicles as well as the Z31. https://dev.z31library.com/xenonzcar_archive/z31/images/Raredare1/Heatercore/hc2s.jpg When installing the new core into the heater core box, you will want to apply some high temperature foam weather stripping to make the core fit correctly. https://dev.z31library.com/xenonzcar_archive/z31/images/Raredare1/Heatercore/hc3s.jpg Hereβs a view of the assembled box. I installed new hoses and clamps. Additionally, the OE firewall gasket was replaced prior to installation. https://dev.z31library.com/xenonzcar_archive/z31/images/Raredare1/Heatercore/hc7s.jpg
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