You need to get a manual on your car to do the job right.
However, here is some advice:
Just had mine replaced. Ford tech told me you only remove about 15 bolts and screws total then loosen the steering column and let it hang down. Then the entire dash is simply moved back out of the way to expose the heater box. He had mine down in 3 hours. There is no manual to tell you how to do this job unless you get one from a ford technician. The Haynes manuals are a joke, don't waste your money buying one. The ford tech said he would show me which bolts to remove. I post that later. Labor cost for this was $700. Heater core was only $75. Antifreeze about another $20. You can do it if you take your time and don't get in a hurry.
rear front or rear?
how to replace a heater core in a 1997 Chevy blazer
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Check the heater core if weather not responsible.
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The heater core resembles a small radiator.
Turn it off.
The dash has to be removed to gain access to the heater box. The heater box then comes out and is split open to replace the core.
If coolant is leaking inside your cabin, you have a leak in the heater core. The only repair is to replace the heater core. Most auto parts stores sell them.
How do you replace a starter in a 1997 F-350 Turbo Pickup?
To many steps to list here. I would recomend purchasing a shop manual for that vehicle if you want to do this job yourself.