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Mmmm, no it can't be retorfitted into yours, but it wouldn't really have anything to do with your problem. REST function is for like if you park the truck and are going to run in to a store for a short time. You can hit the REST button and it will run the climate control at a very slow fan speed to try to keep the interior cool or warm, as the weather dictates. It's really a comfort system, nothing to do with this aux motor running to prevent hot-spotting.
There is NOT a temp related function to help the truck decide to run the aux pump to prevent hot spotting. If you take a stone-cold engine, turn the key to ON (not even starting the engine) and turn the key off, the aux pump will run for the programmed amount of time, then shut off. I don't think it runs for over 5 minutes, not sure on the time factor, but it isn't temperature dependent. The small blower motor in the bottom of the control module box operates in conjunction with the aux coolant pump.
In short, the function is controlled by a timer in the AAM.
Gilly
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