The thermostat is under the housing where the lower radiator hose attaches to the engine.
The thermostat is located underneath the front of the van on the driverside tire side of the vehicle. follow the radiator hose up to the thermostat housing. Note: the rubber o ring must be left in place if you are not planning to replace the thermostat, which, by the way costs like $35.00 and has to be ordered in advance.
on oil pan
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in the pump, which is in the tank.
The gas gauge and thermostat on a 2002 express van are not related. You have two separate problems with the vehicle.
simply find the top radiator hose and follow it down to the engine. That is where the thermostat housing is with the thermostat being located there.
diagram showing where the thermostat is located
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In a 1987 Toyota Van, the thermostat is typically located in the engine compartment, near the engine block. It is situated at the end of the upper radiator hose, where it connects to the engine. To access the thermostat, you may need to remove the upper radiator hose and the housing that covers the thermostat.
Look where the upper radiator hose connects to the engine. There you will find the thermostat.
Follow the top radiator hose to the engine, the thermostat is at the end of it.