Follow the lower radiator hose to the casting covering the thermostat on the front of the motor. This casting is directly underneath the power steering pump. There are three bolts holding the casting onto the block. You will need to use a 10-mm wrench to remove the three bolts. Once you remove the casting, you will have access to the thermostat. You may need to use a pair of pliers to remove it from the block. Once it is removed, there will some anti-freeze that will pour out of the block, so be prepared for the spillage.
Before installing the new thermostat, you should clean the surface of
the block and the surface of the casting that you removed, to make sure
that both surfaces are clean and smooth to ensure a good seal when
bolted back together. You should apply a small amount of
high-temperature sealant on the surface of the block and follow the
instructions on the sealant regarding proper application and drying
times. After doing all of the above, you need to look at the new
thermostat and find a small metal pin that will wiggle when you shake
the thermostat. This is called the "wiggler". It is used as a vent. The
thermostat should be installed with this "wiggler" at the top. After
installing the thermostat into the block, re-mount the casting over the
thermostat and tighten the three bolts evenly to allow the casting to
secure flat to the block. Reconnect the hoses and re-fill the cooling
system.
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SOURCE: thermostat location 2 door 4-liter diagram or photo
follow your top water line on the radiater to the motor thats were your thermostat is should be to bolts holding the casing on
SOURCE: location of thermostat in 1997 chevy luminia 3.1 liter engine
The thermostat is located in the thermostat housing which is on the intake manifold under the throttle body (drivers side) to replace it, your going to have to remove the heat shield to the exhaust crossover and you can remove the two bolts that hold the thermostat in place with the right extension and swivel.
Note you only have to remove one bolt and looses the other one, the housing has a slot cutout to slide it out. Good luck and be safe.
Thank you for suing fixya and here are two links to the type of engine used in your Lumina.
http://www.compnine.com/index.php?u=1&year=1997&artnbr=MW01-008&artsfx=NULL&supplgroup=NULL&catcode=18W&modelcode=W&makecode=C&modelseries=WA&uid=1&modelid=1147577283&capuid=1&majorgroup=01&grouptype=B
http://www.compnine.com/index.php?u=1&year=1997&artnbr=MW01-042&artsfx=NULL&supplgroup=NULL&catcode=18W&modelcode=W&makecode=C&modelseries=WA&uid=1&modelid=1147577283&capuid=1&majorgroup=01&grouptype=B
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