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Ed:
Here is further research on the aux coolant pump. This is all from the 1998 ML intro manual:
"System Operation
Besides maintaining a consistent coolant flow at low road speeds, the auxiliary coolant pump circulates coolant during cold engine operation to circulate warm coolant to the heater core and continues to operate as long as the engine is running (or the key is in position 2). The pump continues to run after the engine is shut down to prevent hot spots and heat soak conditions.
When the coolant temperature is 110C(212F) or below, the auxiliary pump runs for 5 minutes after engine shutdown. If the coolant temperature is above 110C(212F), the auxiliary coolant pump runs for 10 minutes after engine shutdown."
The AAM recieves both temp input direct from the engine coolant temp sensor, and also receives an input from the CAN, although the exact use of the CAN info is not stated. I am sure the module box blower runs in conjunction with the aux coolant pump, but this is not stated in the intro manual.
I am still suspecting either the AAM itself, or possibly the fusebox panel, which the AAM plugs into on the underside, inside the module box.
Gilly
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