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The thermostat for the 3.5 Liter is under a flange bolted to the top of the block (in the valley), connected to it is a black pipe that connects to the lower radiator hose. This flange has four bolts that are accessed only after removing the intake manifold. Removing the housing that connects to the upper radiator housing optional.

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12y ago
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Q: Where is the thermostat located on a 1999 Isuzu Trooper?
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