Tom.......You can work on my C3 anytime. I think you'll be pleased you went ahead and did the lowers with the other work you're doing. The heater core? A thankless PITA! But not C4 PITA. My first lasted 20 years, and cost me a right front cut pile carpet. So my #2 is due now at 27 years. I noted the heater box had some cracking around the flanges which I patched first time with black RTV so I picked up a heater box rebuild kit from Dr. Rebuild for round 2. Don't know if he's still in business. But since this is not your first dance with C3's, you've done this before. Wish I worked as fast as you.
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