Question about 2001 Chevrolet Lumina
You may need a new serpentine belt or belt tensioner if tensioner is wearing out it allows belt to slip sometimes causing temp extremes ps if tensioner is bad belt will also need to be replaced most likely
Posted on Jun 16, 2009
Sounds like an air pocket check the coolant level
Posted on Oct 01, 2008
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Posted on Jan 02, 2017
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What you describe is quite normal. While the engine is running and the coolant is circulating the thermostat maintains the engine within its operating temperature range. When the engine is switched off there is still considerable heat within the engine and the coolant will continue to absorb this heat. With no coolant circulation, the coolant inside the engine will register a temperature rise to the extent your gauge measures. This temperature rise may persist for up to 15 minutes until the natural thermo-syphon of the cooling system starts to dissipate this heat build up and the engine starts to cool down. Because the cooling system is pressurised, the coolant is prevented from boiling off at this temperature above boiling point. Once the engine is restarted the coolant flow is re-established taking this excess heat from the engine and the system temperature returns to normal.
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