Q: How do I replace the heater core? on 2000 Pontiac Sunfire

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we found out the car was heating and loosing coolant, they diagnosed that it is in the heater core. there also was some coolant smell and we found oil in the windscreen.
(2) Answers
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This is a time consuming and technically challenging component to change. You need to drain and properly dispose of the coolant. You need to recover the refrigerant from the air conditioning system. You need to be able to remove the instrument cluster/dash board, remove the heater core case and then install all of those components. Is this a task you are able to perform?
thanks for you answer.We will try , is too expensive considering the car model, because is a lot of labor hours. That's why I was asking for procedure, my son wants to try to do it.
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