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Most likely an air pocket.While your'e driving or while the motor is running put your heater on high(hot air) and after a while the air pocket will be gone.I had the same problem after changing a rad hose and during a two hour road trip ran the heater and everything was ok afterwards

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16y ago
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Q: What would cause the temp gage to vary from cold to hot back to cold while driving 99 lumina?
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