Re: I should have replaced the heater core
In my experience, stop leak buys you a few months. Since we are in summer, you don't really need the heater anyway and it would likely start leaking just in time for winter.
If you don't want to fix today, get one of those by-pass hose fittings from the parts store and skip the stop leak.
I bought a replacement core from O'Reilly's but don't remember which one.
Double check the hose connections at the heater core on the engine side. A leak there can go inside and act like a core leak.
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