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Old 10-16-2017, 11:43 AM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 39,313
 

2003 L-Series 3.0L Sedan
Default Re: heater core or blown head gasket???

At 188k miles (emailed) it's highly possible for coolant leaks as mentioned and hopefully not a heater core leak. You or someone familiar with the HVAC system can check around for wet carpeting by removing console side panels by the floor for a better view. If possible, AutoZone may have a cooling system test kit consisting of a hand held pump, hoses and adapters to substitute for the cooling system cap. Pressurizing a cold engine can sometimes be easier to find leaks instead of being scalded by hot coolant, hoses, radiator, and a hot engine.

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