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.
Car Problem Reports
Mercury Milan Coolant Leakage from Heater Core, Possible Leakage onto Passenger Side Foot Well
Mercury Milan Problem
Average Mileage: 78,255 mi (55,000 mi - 93,765 mi)
When in the car! I smell coolant in the cab of the car. What could be the cause of this and how do I find out where it's coming from
Visitor, 2007 Mercury Milan, 86,000 mi
The front passanger side floor is wet on my Mercury Milan.I was told by a couple of friends it was the heater core. How much does the work cost for this job??
Visitor, 2006 Mercury Milan, 93,765 mi
The electrolysis problem would not occcur if the heater core were thermoplastic. RIDICULOUSLY SIMPLE TO PREVENT.
I had the same problem with a 96 and a 97 Grand Am. I smelled the antifreeze and had to add coolant to them. GM had metal hose ends to a thermoplastic body. The hose ends corroded.
I can't believe that the instrument panel/dash board of this Milan must come out to replace the heater core. RIDICULOUS!