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Get this,
Symptom: Engine overheats.
Problem: Bad battery.
Battery won't charge and overloads the alternator. The extra load on the 100+ AMP alternator wears out the belt and stops turning the water pump pulley. Engine overheats.
Admittedly, an extra high-amp alternator should be running dual v-belts instead of just one, but boiling a little coolant is better than cooking a $200 alternator. Two mechanics at separate shops were unable to diagnose the problem. A $50 battery isn't worth two-hundred-something dollars in diagnostics.
Bad batteries (or bad electrical connections) can cause endless headaches. I'm glad you found the problem. Sometimes I think there should be a drill sergeant to scream "check for voltage!" anytime something isn't working quite right.
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