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Who has changed a heater core -- help?
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Randy Schultz
Posted 2019-11-24 7:01 PM (#590693)
Subject: Who has changed a heater core -- help?


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Posts: 67
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I started my 57 Dodge coronet today and when I shut it off I now have a lot of antifreeze under it. It appears to be coming from the firewall under the heater box (no air). There are two oval holes with rubber flaps on them and it looks like the leak is there. I have a service manual and it does not have a section on heater cores. Do you take the screws off around the box in the engine bay or is it under the dash? Thanks for any help, it does not look easy at all.
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56D500boy
Posted 2019-11-24 7:34 PM (#590695 - in reply to #590693)
Subject: RE: Who has changed a heater core -- help?



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See diagram below. Heater core is Item 8 which is PN 1689 716.

Will look similar to these ones:



Access from the engine bay





Edited by 56D500boy 2019-11-24 7:37 PM




(705HeaterSystemDiagram.jpg)



Attachments
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Attachments 705HeaterSystemDiagram.jpg (176KB - 12 downloads)
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Randy Schultz
Posted 2019-11-24 8:46 PM (#590699 - in reply to #590693)
Subject: Re: Who has changed a heater core -- help?


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Wow that helps a whole bunch. Thank you very much for the help.
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ABloch
Posted 2019-11-24 11:26 PM (#590709 - in reply to #590693)
Subject: Re: Who has changed a heater core -- help?



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This is one of those jobs that you may want to consider swapping out the heater control valve while you are at it. If it's never been done before, just swap it out with a new one and hang onto the original one to have for a core. the originals can be restored. most of the aftermarket ones are throw aways. J.C. Auto can rebuild them.

Not a difficult job to do really. Take your time. Don't over torque the bolts, you'll crack the housing. Any radiator shop should be equipped to repair or re-core reasonably.
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LD3 Greg
Posted 2019-11-24 11:57 PM (#590710 - in reply to #590699)
Subject: Re: Who has changed a heater core -- help?


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Hi Randy,
Check out what underhood components you have to remove to access the bolts and pull off the housing. You will at least have to loosen the blower housing. Be sure to do it carefully because there are only 3 bolts holding it and that plastic is very brittle. To reinstall the blower housing you will need to use putty tape as a gasket. Get lots of foam tape because there are foam gaskets on both sides of the heater core mounting flange. They are good quality copper heater cores and the leak can likely be soldered.
It sounds like the heater core but just be sure it isn't the water control valve that is leaking. They are a real easy fix!!

Tip: before you reinstall the housing, wash it thoroughly inside and out and when completely dry spray paint the inside with scrap paint to seal it. That will go a long way to get rid of some of that old car stink!!
Restore the outer fibreglass surface appearance with black wax boot polish!

Greg
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Randy Schultz
Posted 2019-11-25 10:54 PM (#590756 - in reply to #590710)
Subject: Re: Who has changed a heater core -- help?


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Posts: 67
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Thank you all for the tips and advice. I sure appreciate you guys sharing your experience.
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mikes2nd
Posted 2019-11-26 10:42 AM (#590780 - in reply to #590693)
Subject: Re: Who has changed a heater core -- help?


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https://www.youtube.com/watch?v=x1wfE4k_q_A
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51coronet
Posted 2019-12-03 12:07 PM (#591040 - in reply to #590693)
Subject: Re: Who has changed a heater core -- help?


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Stressing again... clean and seal the inside surfaces once you remove the core. Many of these cars are very rusty there and some have developed holes in the area. Moisture and dust sits inside there so be diligent and use good sealing paint for example por15 to coat the surfaces. Por15 can be painted directly onto rusty surfaces.
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