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Reply to "What would you do about these heater tubes at the heater core end?"

That engine has been running with a shut-off valve or two in the heater lines. The Pantera heater valve can be adjusted to either -A- shut off hot water thru the core completely and open half-way in the winter, or -B- open all the way in winter for heater & defroster, and closes only half-way, so the heater is always at least partially on. There are two different valves and they both act the same way.

Most of us put mechanical shut-off valves in for safety (the short rubber hoses that connect them are infamous for rupturing under the dash at high rpms, and to improve A/C performance, but we open them occasionally so cooling crud doesn't build up.

To replace the stock 50-year old steel lines, you'll need to pull the drivers seat and the entire console and cut the lines to remove. SS is recommended so this never happens again.

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