You're probably going to at least have to have the system flushed.
Here's a little to think about regarding stop-leak for any system:
How can something that can be poured into a fill tube/cap/hole magically find a leak and stop it? There are a few ways to do it.
First, it can thicken the fluid to the point that it's too viscous to flow through a small crack or hole. This makes it harder for pumps to circulate that fluid, and causes it to take longer to flow or drip off of moving parts. This wil obviously cause more wear on moving parts. Think of this as the equivalent of scooping Vaseline into your engine.
Second, it can introduce compound into the system that will harden on contact with air, plugging the hole. The problem with this is that there is not a single system in a car that does not have at least some air in it at some point in time. Think of this as squirting Elmer's Glue into your engine.
Third, it can introduce small particles into the system that will clog up pinholes just like platelettes clotting up a wound. Common applications include that copper powder in water that they call radiator stop-leak. This also plugs up any other openings in the system, like thremostats and radiator passages. Think of this as pouring sand into your engine.
Would you drop blobs of Vaseline into your oil? Would you pour glue into your brake lines? Would you shovel sand into your radiator? I didn't think so. I learned the hard way when my mom put radiator stop-leak in her car and had to thave the system flushed and the radiator, thermostat, and heater core replaced.
Start saving up for the work, and in the meantime, you're going to have to resort to "Arizona 4-40" A/C. That's 4 windows open, driving at 40 miles per hour.
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