The engine is a GM 2.2L and on the rear (trans.) side of the head is a plate with two elbow fittings and a cross flow hose connecting the two fittings together. It's either a heat exchanger or dual output cooling or heating lines for something. Mechanic is afraid to remove the plate without knowing whats inside as the truck is needed in service at all times, and yes the plate is leaking coolant.
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