Its on the bottom drivers side of the radiator. Just inside the bottom of the wheel well lip is your easiest access. It should be a plastic "key" type on that truck.
May be a plug at the bottom or rear bottom of radiator
follow lower radiator hose back to engine.
Look in a removable housing at the engine end of the upper radiator hose
On my 95 pickup with 4 cylinder engine, the thermostat is located where the lower radiator hose enters the engine block. Hope this helps.
Look at the bottom or rear of the radiator
That is the item that is between the radiator and the grill, It covers the front of the radiator.
Bottom of the radiator.
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On top of the engine attached to the top radiator hose. Two bolts holding it in, take them off and the thermostat is right there.
The radiator drain plug on a 2001 Dodge Ram 3500 pickup truck with a 5.9 liter diesel engine is on the bottom inside corner of the radiator. It is on the driver's side.
Follow the upper radiator hose from the radiator towards the engine. The upper radiator hose is connected to the thermostat housing on the engine side.
On my 92 Toyota Pickup V6 4X4, it is located in a different section than on the 4cyl. If you are looking straight at the engine, look to your right and down into the engine. Look for the LOWER radiator hose and follow it into the engine block. Romove the housing and this is where the thermostat on my truck was located
follow your top radiator hose to your intake,its in their.