Usually the key is turned off. More information will help get better answers.
Blown fuse, defective thermal relay, or bad fan motor.
you would have to change the heads and timing cover no you dont have to swap heads or timing cover! it is a direct swap! motor has been in the lumina for about a month now its running great!
R134A
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On the muffler
You can't, they are bolted in
the single belt that runs around the engine, alternator, a/c and water pump is the serpentine belt.
Read the owners manule.
What is the avearage cost to fix a blow headgasket on a 98 lumina
Alternator is not charging battery sufficiently check with voltmeter With engine running voltmeter should read 13.8-14.2
I have a 95 Lumina 3.1 and it would cut out of gear when I would stop, it turned out to be the sprag gear in the transmission. $$$$
it might be out of gas, mine did that once. and theres a sensor behind the air breather beside the battery if any of these are unplugged from the brerather housing the car could shut off, especially when you stop