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There is no magic formula climb under there and unplug everything you can find between the dash and car.Then take out the side kick panels take out the end brackets there is also screws up where the dash and windshield to meet.Once you get the dash loose there will be more wires to unplug.If your changing years my 86 has a 93 dash then make sure heater controls are compatible or what you need to change with it.I changed the heater itself so I could have air conditioning later and I knew the controls worked together.