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What to replace
Ed:
With all due respect, I don't think you should be asking them to replace anything. I would relate what you noted in regards to the aux coolant pump running, but leave it at that. Complaint should be: Owner states battery went dead, upon installing battery charger, owner noted aux coolant pump running.
The pump may have been triggered on if the charger was installed with the key on, then key turned off, may have tripped it on. I don't believe the power supply for the aux pump is through a seperate timing device. it would come from probably the ME control unit, or possibly the AAM. I could look it up if you want to know for sure. The aux coolant pump does run on a time interval only, not temp influenced.
Gilly
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