Coolant Leakage from Heater Core, Possible Leakage onto Passenger Side Foot Well on Mercury Montego

Electrolysis can cause repeated failures of the heater core and radiator. The diagnosing technician should check for voltage present in the coolant, with the battery disconnected, because electrical current in the coolant causes electrolysis. Corroded or deteriorated parts should be replaced, and the coolant should be flushed. Ground straps can be added to help prevent future corrosion of components.

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Average mileage: 15,120 (180–45,000)
3 model years affected: 2005, 2006, 2007
6 people reported this problem
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problem details
floor wet , happens predictably , no heat window fogs
2006 Mercury Montego 180 mi,
floor wet on drivers side , no heater window fogging up in warm weather
2007 Mercury Montego 45,000 mi,
Yeah,...ditto