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If the temperature gauge and heat only work while the engine is idling, it may indicate a problem with the cooling system, such as a malfunctioning thermostat that is stuck open, preventing the engine from reaching optimal operating temperature. Additionally, low coolant levels or a failing water pump could impede proper circulation, affecting heat output. When idling, the engine runs at a lower RPM, which can sometimes allow for temporary heat buildup, but once the vehicle is in motion, the cooling system may not function effectively, leading to a drop in heat and gauge readings.

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4w ago

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