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If it's leaking from INSIDE the firewall (away from the engine compartment) you probably have a leaking heater control valve or damaged heater core.

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โˆ™ 2006-04-02 21:25:16
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Q: What would cause a 1989 sunbird 2.0lL K engine to a have coolant leak coming from drain plug in firewall Not leaking inside coolant coming from rubber elbow connected through firewall?
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