How do you replace the heater core on a 1991 Mercury Cougar 3.8L V6 and where is it?

Answer 1

You have to pull the dashboard out to get to it. If you are mechanically inclined, then I suggest you obtain a factory service manual for your specific car(they can be found on eBay pretty cheap sometimes) and also go to TCCoA.com -that's Thunderbird & Cougar Club of America and do some research in the forums & tech articles. Also whether you or someone else does the job, do yourself a favor and put a ground wire/strap on the new one to make it last longer. This helps null the electrolytic reaction between the anti-freeze and the heater core which eats at the metal and causes premature failure. It's a all day job & you will need help to lift the dash and move it into the front seats, also do a thorough cleaning job on the blower box it's mounted in to remove all the anti-freeze or you will have a smell for quite a while after replacement.