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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 15,120 (180–45,000)
3 model years affected: 2005, 2006, 2007
6 people reported this problem
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floor wet , happens predictably , no heat window fogs
floor wet on drivers side , no heater window fogging up in warm weather