You take it to a mechanic. You need to do an alignment when anything is done to the front end.
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By going to a garage
See the answer for "How do you replace the drive belt in a 2000 Ford Focus?". The procedure is the same.
About $1000 each.
There are 4 screws that hold it on.
Material and labor... about $400.
You have to take half the car apart to replace the heater core
Go to Napa and buy a Repair Manual.
From the inside, behind the panels.