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Started up the ‘66 427 coupe and noticed a puff of steam in the passenger footwell. It’s pretty much an original car, so I doubt the heater core’s ever been messed with. I’m guessing it’s time for a new core. I haven’t changed a core on an assembled car, so any hints before I dig into it would be nice…thanks,
Get the foam seal kit from Paragon as you will need to replace all the seals . . . and the small core hold down wires and screws might need to be replaced as well.
This has been well covered, but the tricky thing is the one nut on the inside upper left of the duct work below the wiper. Get your reseal kit and follow along. You can loosen the nut and slide the duct work out. You Tube videos cover this effort. When you get the new one, have it pressure tested to about 18lbs. Dennis
When mine cut loose several years ago (67 427) I ended up with several inches of green coolant in my passenger side foot well. Good to change it before it gets to that point. Several Forum members have written detailed instructions on removal and re-installation of the heater core with all of the tips and tricks and may be willing to share those procedures via a PM and then email. Do an archive search and likely you will find those members. Good Luck with it. C.J.
Check with one of our Forum brothers - Mark at warrenmj He may be willing to share.
There are a few videos out there, the best reminder from them being to watch out for the single attachment in back of the radio.
Back in high school in ‘66, my Dad had a ‘63 Impala SS 409-340 Powerglide that blew the heater core twice, each time when I took it over 3500 RPMs, What a mess it made of the silver blue carpet.
On a side note, hard to believe this paint is from ‘69:
Last edited by Vettrocious; May 16, 2022 at 09:33 AM.
If you will drive it before fixing it put a shut off valve in the heater hose to prevent coolant from entering the heater core. You dont want to ruin your carpet.
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‘66 heater core
Dennis
