Question about 1991 Buick Century
Yes it is very possible for that to happen. IT would happen if the coolant froze and the engine was run before the coolant thawed out properly.
Posted on Jan 01, 2014
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Posted on Jan 02, 2017
SOURCE: heating coil gone water leaking
What you have to do is unhook the heater core and loop one of the hoses. Go in the engine compartment and unclamp the 2 hoses from the heater core at the firewall  in below picture. Also unclamp one of the hoses at the engine, and circle the other hose back onto that pipe, so that one hose is no longer used but the second hose goes from the engine right back to the engine. Let me know if you have questions.
Posted on Oct 08, 2010
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