** -why would it get so cold so fast inside the dishwasher **
Frankly I don't see how it is possible either. There shouldn't be anything in a dishwasher that could remove that much heat from its water.
** why would the dishwasher not heat when the dishwasher is on 'Smartwash'? **
I'm afraid I am not familiar with the "Smartwash" function. Someone would have to look at the dishwasher's wiring diagram for the timing chart for the control to see in what parts in each cycle it is suppose to be heating. Have you tried any other cycles besides the Smart Wash?
If it wasn't heating *in any cycle*, the element could be defective, one of the thermostats in series with it open or a problem in the electronic control.
JFYI
Dan O.
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