My van is a 1996 with a 4.3L so assuming you have a 4.3L which you probably do. The top radiator hose will lead you right to the t-stat housing. I am assuming you are talking about the t-stat for your radiator and not the t-stat for your A/C or any other t-stat. Just find the top radiator house and follow it to the engine. It connects to the t-stat housing at the top front of the engine. The housing is connected via 2 bolts. Remove the air cleaner assembly and the top of the fan shroud (If yours is like my 1996, the fan shroud has a top half and a bottom half) to gain easier access. Kudos to the GM engineer that designed the 2-piece fan shroud!! .
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A 1998 Chevy astro has shocks instead of sturts.
Should be in housing at the end of upper radiator hose
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Open the hood, locate the upper radiator hose on the radiator, follow the hose from the radiator, it will lead you to the thermostat housing on the engine, the thermostat is located under the thermostat housing.
Try in housing at the engine end of the upper radiator hose
Astro has no AC (cabin) filter.
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In my 1998 Chevy Astro V-6 it is 4.5 quarts. check an owners manual.
if you are refering to the sensor for the fuel gauge, it is in the fuel tank with the fuel pump.
The thermostat is located on the driver's side of the engine. The thermostat and thermostat housing is mounted on the lower intake manifold. You should be able to follow the radiator hose up to the housing. It is a little hard to see however. Mike