The gas gauge and thermostat on a 2002 express van are not related. You have two separate problems with the vehicle.
It is Located Behindthebottom hose on the face of the water pump.Factory OEM recommends a 186 Degree Thermostat.
The thermostat on a 6 liter 2003 Chevy express is located on the left side of the water pump. The thermostat is a one piece unit attached to the thermostat housing, which is then mounted to the upper left side of the water pump. The average cost for this one piece thermostat/housing is around $25.00.
Follow the upper radiator hose from the radiator to the engine. Where the hose is attached at the engine is the thermostat housing. Drain some coolant from the radiator thru the petcock, remove upper radiator hose from thermostat housing, remove thermostat housing then remove the thermostat. On the Express van you will probably need to remove the air filter assembly to gain room to work.
Drain the vans radiator. Remove the top radiator hose and water inlet. take the thermostat out. Put in the new thermostat and re install the inlet and hose. Refill the radiator.
Where is the thermostat located in a 2004 Chevy SSR
Bad thermostat, radiator, improperly working fan.
click on the related link below and look for figure 11
Either the thermostat is not working properly or the temperature sensor is displaying wrong on your gauge.
Remove the water supply hose from your Chevy Equinox thermostat housing. Remove the thermostat housing retaining bolts. Lift the old thermostat out and drop in the new thermostat.
how do you change a thermostat sensor in a 2001 Chevy cavalier and where is it
Give me a diagram of the location of the thermostat on a 2001 Chevy Malibu
Remove the water supply hose from your 1987 Chevy Astro thermostat housing. Remove the thermostat housing retaining bolts. Remove the old thermostat and drive in the new thermostat.