The question you ask is too involved for a proper answer. You may want to go to a car parts store, or book store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
Same answer, here. They sat that heater core on a stand and built the car around it. Good luck!
You can go to AutoZone.com and enter all the info on your car and get the step by step instructions on how to repair any part you need to for free.
You have to take half the car apart to replace the heater core
Program a new key and ignition to a 2000 ford focus
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the 2000 ford focus has struts on the front. you can buy the strut/spring assembly for about 250 a pair online.
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See the answer for "How do you replace the drive belt in a 2000 Ford Focus?". The procedure is the same.
Remove oil pan
See link below
Drop the gas tank.
All that you need to do is unscrew if from the suction side and replace it...........
I am very sorry. I was under the impression that if I go to the address bar and ask a question. The answer would be right forecoming. I only asked how to replace the heater core on a 2000 ford taurus. And received only run-arounds.