How do you change the heater core in a 1986 Ford Ranger?
You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library. WAA
An actual answer can be found here: http://www.fordrangerforum.com/4-cylinder-tech/2899-1986-ford-ranger-heater-core.html
Sorry your question was answered by such an idiot.
same way as any other block heater... ========================================================== Your Ford Ranger block heater is just like the heating element in an electric kettle . As long as the electric block heater is plugged in to an electric outlet that has power to it , the block heater keeps on heating the engine coolant if everything is working correctly