mystery fire wall coolant connection - air conditioned 68 Newport

Early C Bodies - The Slab Side Years

  1. Mike McGuire

    Mike McGuire Member

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    Hello,

    Subject car is an H-code 68 Newport with AC.

    It has 4 heater core sized ~1 inch hose connections on the passenger side. (2 long hoses to the water pump housing, and 1 shorty between the 2 pairs. on the fire wall.)

    Over on the driver's side there is a smaller half inch or so hose connection, currently unpopulated. This car hasn't been run in a long time, and while test running it yesterday we noticed coolant coming from this tube.

    Can someone tell me where this is supposed to be connected and what is it used for?

    Thanks,
    Mike



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  2. patrick66

    patrick66 Old Man with a Hat

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    That is a drain for condensation, that has a formed hose that slips over that, and points downward. It connects to nothing forward of the cowl. My Coronet has the same hole, with the same function.

    If you have coolant coming out there, you likely have a heater core leaking.
     
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  3. Mike McGuire

    Mike McGuire Member

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    OK, that makes sense. We saw coolant on the floor, under the motor in the back (starboard side), and suspected heater core. Inside there was no moisture to be found under the glove box area, on the carpet, where I would normally find it. Perhaps daylight will help pin point the source. Going with heater core.
    Do you know if the dual heater core was an option on some cars?

    Thanks !!!
     
  4. patrick66

    patrick66 Old Man with a Hat

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    I know on Imperial it was; but on NY/Newport, I'm not certain.

    That formed hose WAS available through Year One. Couldn't find it just now.
     
    Last edited: Apr 7, 2021
  5. Polara_500

    Polara_500 Senior Member FCBO Gold Member

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    Should be a dual heater core with AC.
     
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  6. rapidtrans

    rapidtrans Senior Member FCBO Gold Member

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    And keep that nipple clear of the exhaust manifold.
    We had a brand new Fifth Ave heater box fill with water, eventually running all over the carpet. The dealer diagnosed it without even looking at car. Apparently the factory installed a “too long” elbow fitting on a run of cars and the manifold heat melted the fitting closed!
     
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  7. live4theking

    live4theking Old Man with a Hat

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    I have had a number of these boxes apart. Since the car had ac it should have a dual heater core. New ones are available on Ebay.
     
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  8. Mike McGuire

    Mike McGuire Member

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    Thanks for that. I wonder why. Was it to draw more heat from the motor??
     
  9. Mike McGuire

    Mike McGuire Member

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    Thanks Will do.
     
  10. Mike McGuire

    Mike McGuire Member

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    Thanks!
     
  11. Polara_500

    Polara_500 Senior Member FCBO Gold Member

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    I believe it was for finer heat/cooling control. There's a valve between the two heat cores that shuts when you turn on the A/C, so only half the core has any chance at heating and the variable control valve I think is supposed to control how much it gets so you don't necessarily have only cool air on A/C depending on the temp selector slider. This only shows a little over half of the core, but does show the valve which is controlled by a linkage to the dash air duct valve.
    upload_2021-4-7_15-23-43.png
     
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  12. Davea Lux

    Davea Lux Old Man with a Hat FCBO Gold Member

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    Before you spring for a new core, check those two short hoses for leaks, a lot of them are rotten after 50+ years. Probably a good idea to have the core pressure tested if the hoses are bad as the cores are a PIA to replace. Your local radiator shop can tell you if the core is worth putting back in.

    Dave
     
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  13. patrick66

    patrick66 Old Man with a Hat

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  14. rapidtrans

    rapidtrans Senior Member FCBO Gold Member

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    The third one down is the one I’ve seen for condensate drain. Should have that pinched end to keep bugs out.
     
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  15. marty koirtyohann

    marty koirtyohann Member

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    thats right . all of the older ac cars ha to have a drain hole for the condensation to drain out of . a old mechanics trick . if i have fogging windows with the heater on the leak is in the top of the core i if it get the floor wet or comes out the weep hole the leak is in the bottom of the core . in most cases u can't get the rebuilt they dont make them anymore i got mine from a ebay shop in cal i got a new evaporator from the same shop