1998 Isuzu Rodeo 3.2L DOHC 24V, 101,000K, auto, My engine heats up quickly and occasionally seems to run hot according to dash gauge; since I bought it used, I want to replace the thermostat. However, the Hanes manual doens't provide info for the thermostat on this engine. First problem, I have looked in all the usual places, but I can't find it - it's not located in the front housing where the upper rad hose connects. I sense that it may be under the intake manifold (plenum) on the rear side of the engine - can anyone confirm the location of the thermostat on this engine. Any words of wisdow for replacing it?