My heating core sprung a leak a few days ago, and filled my floorboard with coolant while I was going down the highway. Any suggestions on where I can find a replacement? Or can it be "welded"? Haven't taken it out yet, and have no idea what caused the leak. It doesn't look NAPA has any......

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63 Dart GT Convertible

p/n 2277 535, 3744266 plain white box (no manufacture name) typical RockAuto part number

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1964 Dodge Dart 270 four door. Three speed automatic 225 Slant with a Carter BBS carb.

The old heater core may or may not be repairable. Generally what happens to radiators and heater cores they rot from the inside out from not changing coolant often enough to keep it becoming acidic.

Probably you unit's tubing is getting real thin, and resoldering it won't keep your floor dry for long before it ruptures again.

Napa, Rock Auto, and others carry heater cores, and for all the work to get one out, you will be better off getting a new unit, and be done with it. This may also be a good time to rebuild your heater box, if needed, where it will be almost completely disassembled anyway.

Detroit Muscle has heater box rebuild kits.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

I took apart my heater box, and look what I found:



So, wow. Well, it lasted over 50 years before it sprung a leak. I took the core to a local radiator shop, and they were able to replace the core with a similar-sized Ford core, three hours later. Up and running and hot as ever. Pretty simple to remove, didn't even disconnect the controller and cables.

BTW, any opinions on what hose from the water pump should go to which tube? Top from pump to left or right as you are looking at the firewall? Not much direction in the FSM, just one picture shows the top from pump going to left tube, but pictures I took of my engine a few years ago show it to the right tube.

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63 Dart GT Convertible