Date registered: Oct 2007
Vehicle: 30+ mercedes and a suburban to tow them
Location: Long Island, NY
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there are several little variations to the wiring for the thermostat controlled fans. In that picture that's posted, notice the gizmo at the top of the thermostat housing. There is also wiring on the side of the head and probably something tied into the AC if you have it.
Also, it's unlikely that the thermostat spontaneously went bad when something else broke. If they pulled it, there is the chance that it was installed backwards or upside down.
The thermostat should have bleed hole in the plate. Also, it sits in the housing slanted so that it is higher at the front than the back. That bleed hole should be facing front so it's not at the low point in the coolant stream.
If you remove the thermostat, be sure to use a 6 point socket or wrench and check the bolts for corrosion. Nothing worse than having one break on you. It becomes a much bigger job to have the broken bolt drilled out.