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Your van makes a humming noise when your car is idling and when you accelerate the gas pedal?
Wiki User
∙ 14y ago
This might be the cooling fan which in today's cars is electric and runs only when needed, not continuously like the 50's and 60's vehicles. When you sit idling, with no cooling air passing over the engine, the coolant temperature rises and causes the fan to switch on. This could also happen during acceleration.
Wiki User
∙ 14y ago
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