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hey guys, Im wondering if anyone's had any success, sealing a leaking heater core with alumaseal or bar's stop leak. Yes, I'm aware that the, " right way " is to R&R the core, but after reviewing the entire procedure, ( including having a shop empty all the refrigerant from the a/c system ) if I understood it correctly, I'm thinking maybe stop leak is worth a shot? This is my first posting on the forum, I hope I did it ok. thanks
 

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Using a stop leak to fix a leaking heater core will do a few things; plug the leak in the heater core, plug holes in cooling passages to your engine, gum up your thermostat, gum up your radiator, gum up your heater core (so you won't have heat anyway). If you use the stop leak only as a temporary fix and get the leaking heater core fixed immediately afterwards you should be fine. Otherwise you'll be due for many coolant flushes to get rid of all the stop leak.

In the long run, it's not worth it. Spend the money now (or do it yourself) or spend thousands later on to replace an engine and whole cooling system.
 
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