Thank You for requesting me. The heater core replacement is a fairly involved repair. It takes a seasoned tech five to six hours to replace. If you are up for the task, I will do my best to instruct you. I will cut and paste the instructions from my on line information source. Keep in mind these manuals are written for the professional technician and MANY details are omitted. The basic procedures are listed and you must figure out the how to details. It hass been some time since I have had the pleasure of doing one of these. I looked over the instructions and they look complete, but like I said, missing details. So here is what I have, why don't you look it over and as you go if you have any questions, let me know. Keep in mind that the A/C system must be discarded and charged. Not only is it illegal and bad for the mother earth, but I think R-12 is about $40 a pound (?). Here it is.
Thanks again for requesting me should (when) you have any more questions for me on this matter, please do not hesitate to ask. I want you to be 100% satisfied with my answer.
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Jake "THE AUDI DOCTOR"