dartfreak75 said

Yes I agree but if the heater core is hooked up and connected and the core is stopped up it will limit the flow thus causing overheating. That's why I said to bypass the core and test it out if he hasnt done so already. I had a s10 that had a leak in the radiator and like a dunbass I put stop leak in it and it did stop leaking but it gummed the core up and it started over heating. I bypassed the core and it stopped.

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