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How to replace a heater core in a 2004 Ford Explorer ~ Slim Shadetree Mechanics.
Always check the fluid specifications in the manual that came with your specific vehicle year and motor. In this video, the OEM Motorcraft Gold coolant was used as specified, which is NOT a dexcool type. A Zerex G-05 brand type should be equivalent.
Note, I made an incorrect reference to the Ford Pinto as the direct cause for the development of the inertia switch.
Update with DISCLAIMER. There may be a way to replace the heater core without removing the dashboard. At the 11:38 mark, it shows why the dash needs to be removed; essentially there is a bracket in the way that prevents the heater core removal. But it looks like if the lines to the heater core were cut and replaced with hoses w/clamps, there may be a way to get around dashboard removal. Access to the screws for the plastic ducts may be difficult, but it may be possible. I'm not sure if anyone has done this successfully.