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Why does radiator fan keep running when engine is shut off on a 2001 Chevy impala?
Wiki User
∙ 16y ago
Ever since electric fans started appearing in cars as stock factory items, they've been controlled by thermostats, just like the thermostat in your home A/C system. They typically are hard-wired (not through the ignition switch) so as to help continue to cool the engine, even after you've shut it off. All engines suffer from some degree of what's known as "heat-soak", or the condition of residual heat in the block continuing to heat the coolant for some time after the engine is shut off. Left unchecked, this can lead to elevated temperatures under the hood, causing drastic pressure spikes in both the coolant and fuel circuits. Remember, there's no longer any air moving under the hood. Granted, there's pressure relief controls to handle this, but they bring about the possibility of dumping fuel and glycol overboard.
Wiki User
∙ 16y ago
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