{Chrysler 300} 64 heater box seal

["'ALLAN POZDOL' via Chrysler 300 Club International" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>]

Can I ask what is the prevailing wisdom on sealing up the heater box and core? The manual says use mastic!

 

The radiator shop that re-cored the heater just gooped up both surfaces to get by. The original gasket was under it all but useless.

 

I have a new foam seal; does this need any other sealant other than something holding it to the core? Nothing of the foam surface?

 

I am guessing that some thin strip caulk will suffice between the core and the housing? I scraped out some old yellow crud under there.

 

Allan

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