68 Dart Heater Core Replacement

[m99roadster]

To replace the heater core is there some kind of gasket or sealant behind the heater core. I've been told that when I replace it i need to reseal it. I thought I only needed to pop the clips off the front of the heater box, remove 4 phillips screws and slide it out to remove. To replace it I just push it straight in replace the 4 phillips screws put the front of the heater box on and replace the clips. Am I missing something?

 

[George R]

Only seal I can think of goes between the box halves. Factory used some kind of dum-dum to seal it up. I think that dum-dum is called "rope seal", and it's available at Home Depot.

Easy job. Take your time, clean the inside of the box out while it's out of the car.

George

 

[cudacrazy67]

There should be a seal where the tubes go through the firewall. Wraps around the tubes. It keeps water out of the pass. Compartment.

 

[BillGrissom]

You can use many things for that firewall seal. I would cut some black foam rubber to fit on the inside, over the tubes. I have a HF hole punch set I use all the time for such things. You could also seal it from the engine side, using stuff in the Home Depot door/window seals, but might look ugly. The water cudacrazy67 is talking about is rainwater that drips down from the cowl.