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Now.. not knowing what erratic is to you, but with personal experience, you very well could have a cracked head gasket, or you could need a new water pump, or your thermostat could be in need of replacement.

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โˆ™ 2007-01-04 20:14:53
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Q: What could make the temperature gauge erratic on an Olds Cutlass Supreme SL after the installation of a new battery alternator and coolant hose?
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