How to replace heater coil

Which model do you have? Your best bet is get a copy of the manufacturer's service manual. You'll find them on eBay. That will give you the pages of instructions along with drawings. If your car is front-wheel-drive, look for the manual for an Aries and Reliant. If you have the rear-wheel-drive model, a Dodge Diplomat / Chrysler Fifth Ave. Will be the same.

You'll need to disconnect the air conditioning lines. That, and recharging the system should be left to trained professionals. They will take the necessary safety precautions to prevent blindness and frostbite.