Hello,
You will need to evacuate the A/C system and drain the coolant. Disconnect the battery as well.
https://www.2carpros.com/articles/re-charge-an-air-conditioner-system
Here are the diagrams and instructions below on how to remove the dash and replace the heater core there are many so check out each one. Also if you get stuck please take video or images of the problem and upload them here.
Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
Cheers, Ken
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Wednesday, October 3rd, 2018 AT 12:53 PM