On my 87 5ktq the electric coolant pump is missing and the radiator fan runs for a long time after the car is turned off (after what I am led to believe is the couple of minute soak period). I have a new battery, but this morning it wasn't powerful enough to start the car (-16 degF). How can I diable the afterrun radiator system or at least shorten it by 3/4? John Katos 87 5000cs TQ