It looks like you will need to remove the dashboard because there is a mounting bolt at the top of the heater case. Also, you will need to vacuum down and recharge the A/C system. Here is a video to help show you how. Disconnect the battery and drain the coolant.
https://youtu.be/4EqdrBVb0sY
Here are the instructions on how to change out the heater core in the images below. Start by removing the upper dash mounting screws and the main mounting bolts on either side of the dash down low. You also will need to remove the steering column bolts as well. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can walk you through the repair.
Images (Click to make bigger)
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Monday, December 19th, 2022 AT 10:39 AM