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.
Average mileage: 84,941 (55,000–105,000)
8 people reported this problem
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!