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Q: Coolant Leak on 1996 Cadillac Seville STS

I have a coolant leak that is behind my passenger side front wheel area, I have replaced the water pump & the radiator neither of which was leaking from that area so is it safe to assume the heater core is the problem?
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I would not jump to the conclusion that it is a heater core leak without first doing a cooling system pressure check. The way an automotive shop would locate the leak is by removing the radiator car and attaching an adapter that screws on in place of the radiator cap. Something that looks like a bicycle pump with a pressure gauge attached to it is used to "pump up" pressure to simulate pressure generated when the cooling system is at operating temperature, the leak is then found sometimes it is obviously leaking from a coolant hose or cracked housing, failed gasket or water pump, sometimes the engines cooling system needs to be inspected from below or inspected using a mirror and flash light.
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The pressure in the cooling system actually builds up when you switch off the engine as the wate rpump no longer circulates engine coolant to the radiator to cool it. After a few minutes the hot coolant dissipates heat through the engine block and cooling system components when the engine is switched off.
But the coolant only comes/pours our once the engine is turned off, when the "pressure" is released.
Empty your coolant resavoir with a turkey baster , disassemble ,check if cracked ,
specially on the connection with the hose.
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