Heating AC and Engine Cooling
Water Pumps
Grand Prix GTP
Overheating (Engines)

What is happening when the temperature gauge reads overheating intermittently but the engine is not overheating and then the gauge eventually goes back to normal?



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If it's a VW, it's the water pump. For the temp gauge to read properly, it must have LIQUID coolant flowing over it. Steam will not provide a proper reading. If there's a coolant leak, it could produce a fluctuating reading. If you're losing coolant but not finding coolant puddling under your car, then the leak is not just a hose or line. It could be a manifold gasket or something. That ain't good. I recently ditched an old car because of that exact problem.