Heater core replacement- Jeez!

Discussion in 'Lounge' started by beerbelly, Mar 22, 2022.

  1. beerbelly

    beerbelly In Maximum Overdrive SILVER MEMBER

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    Rock Auto has me confused; they call for a 7 lb. cap for a '65 289 Ranchero, but 13 lb. caps for a Falcon and a Mustang, same year and engine. I can't find any spec for cap pressure in my manual, but I went with the odds when I replaced the 16 lb. Cold Case radiator cap with a 13 lb. version.

    Ranchero cap.png Falcon cap.png Mustang cap.png
     
  2. Hillbilly

    Hillbilly In Maximum Overdrive

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    Got to agree about GM and shoddy evaporator cores. Out of the five 1996 Buick Roadmaster wagons I have owned, had to replace all five evaporator cores. Went back with NAPA brand cores and have had no recuring problems. Heater cores haven't leaked but they all had to be back flushed to remove casting sand. Almost as annoying as having to deal with their crappy Opti-Spark distributors.
     
  3. handy_andy_cv64

    handy_andy_cv64 In Maximum Overdrive SILVER MEMBER

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    Y'all already know how I feel about Opti-Spark. But casting sand, in a heater core? That's as unforgivable as finding it in a block or cylinder head.
     
  4. Hillbilly

    Hillbilly In Maximum Overdrive

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    Common problem on the LT-1 engine GM cars.
     
  5. handy_andy_cv64

    handy_andy_cv64 In Maximum Overdrive SILVER MEMBER

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    The only time I found casting sand in anything was a Jeep 4.0L that had a leaky rear freeze plug. I think I scooped and flushed about 2 dry pounds sand. Any amount is bad, but that much? That's quite unforgivable.
     
  6. beerbelly

    beerbelly In Maximum Overdrive SILVER MEMBER

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    The new aluminum core arrived today; it looks good and fits perfectly. So now I'm trying to convince my body to re-install the heater.:(
    If anyone needs one, it's a Scott Drake C5DZ-18476-AL that I got from Summit.

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  7. beerbelly

    beerbelly In Maximum Overdrive SILVER MEMBER

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    All done, new antifreeze and a test drive- no leaks!:D
     
  8. pmrphil

    pmrphil In Maximum Overdrive GOLD MEMBER

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    By chance did you check and see where it's manufactured? Scott Drake stuff used to be the best, but Holley bought them out. :eek:
     
  9. beerbelly

    beerbelly In Maximum Overdrive SILVER MEMBER

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    Oh, I think you can guess....and the previous one came from Mexico. But I sure wasn't gonna pay for an NOS one.

    20220908_145600.jpg Screen Shot 2022-09-08 at 3.02.37 PM.png
     
  10. pmrphil

    pmrphil In Maximum Overdrive GOLD MEMBER

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    Oh, hell, NO. :eek: I'd be putting in the same thing as you!!
     
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  11. 1979 RANCHERO GT

    1979 RANCHERO GT In Maximum Overdrive

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    My wonder is the intake and return appear to be coming out of the same tank. Hopefully they are separated or I don't think much coolant is going to go through the core.
     
  12. handy_andy_cv64

    handy_andy_cv64 In Maximum Overdrive SILVER MEMBER

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    Nearly all cores are that way; the velocity of the water pushes it through the core. If the tubes get blocked, there's still coolant flow.
     

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