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Old 07-19-2011, 11:32 PM   #60
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Drives: Black 2010 2LT/RS Camaro
Join Date: Apr 2010
Location: Boston
Posts: 2,460
Originally Posted by caligrown562 View Post
If you have the heater core problem will it just start leaking? Or by using the heater it will cause this problem?
The heater core is a small heat exchanger, just like the radiator. Coolant is always circulating through the heater core, as it is part of the whole cooling circuit from the engine, to the radiator, to the heater core. So, even if you're not using the heater, the core is still "working". What does change when you use the heater, is the fan turns on, and a damper (or "doorway") moves to let the incoming air go over the heater core to warm up the air.

So, to answer your question, it will just start leaking, regardless if you use the heater or not.
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