You need to follow the instructions in your FSM to get the old heater core out for inspection. You should be able to see signs of water leakage in the housing after you remove the core. If you don't see leakage evidence there, take a careful look at everything else hooked to your cooling system, especially the heater control valve - your leak may be there. Take the core to your local radiator shop for a pressure test. If it fails, let them fix it. There is an outfit selling heater cores for old MOPARs on eBay - I haven't dealt with them because they couldn't help on the special core for the ATC cars, but they did have one for a standard 67 heater, and may have one for yours too. The price might be better than having yours repaired, or it might not - you'll have to do the research. I recently had the core on my project 67 tested, and it failed. Then I found out that the cars with ATC have a different core, one which is no longer available without adapting another, much larger core, so the cost of rebuilding it was quite high, but it can be done. Dick Benjamin -----Original Message----- From: mailing-list-owner@xxxxxxxxxxxxxxxx [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Chris "Creesto" Lynch Sent: Friday, December 10, 2004 6:22 AM To: mailing-list@xxxxxxxxxxxxxxxx Subject: IML: Smoke on Dash equals Heater Coil leak As many of you suspected, I did find a small puddle of coolant on the passenger's side mat. Now, who has done this repair/replacment in a '66? How involved? And where did you find parts? I bookmarked a bunch of ads in Hemmings, but I also tried NAPA who was no help (and this is a GREAT NAPA store: always able to find parts for my '62 C*met). I'm hoping this won't be expensive or the kind of thing where I have to put in something questionable from a junkyard. Thanks for the further info in advance. ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm