The thermostat is at the left (driver) side of the engine under the air intake tube. To replace, drain the coolant, take off the engine air intake tube connected to the intake manifold on top of the engine and take off the air cleaner housing at the left side of the engine. Then take off the large coolant hose going to the engine on the left side. The thermostat is inside the cast aluminum flanged nipple housing that the large coolant tube is connected to. The bottom of the two bolts that connect the housing looks impossible to get at, but you can access 1/12 of a turn at a time with a standard open end wrench from under the exhaust. You do not need to remove the exhaust manifold, but getting behind and under it is tight. You do not need to completely remove both bolts that hold the flange on because the flange has an open slot. If you take out the bottom bolt, getting it started would be hard because it is quite hidden.
108mph for the 3100 engine
click on the related link below and look for figure 11
The oil pump is found on the bottom on the 1995 Chevy Lumina's engine. It is mounted on the front of the crankshaft
if the car is a 95 and up, it under the exhaust crossover pipe
I recently had a 1990 Chevy lumina apv 3.1L engine put into my 1992 Pontiac transport, if that answers your question.
yes
Is that lumina van or lumina car? BClear. 3100, 3400.
yes, same motor
take it to a mechanic
Around 3100-3200 lbs
No
Check actual engine temperature with a thermometer--if in acceptable range temperature sensor or gauge may be defective