1998 Buick /Lesabre 3800.

Question: my car never ran hot or gave me any problems one day it started riding funny so i
pulled over and turned the car off when i lifted up the hood it was no water in it and there was no
sign of leakage(water was in it a couple days prior).I put water in it, but then it wouldn't crank.
Please tell me what could this possibly be??

Answer: The conditions you are describing are tell-tale signs that the
"Upper intake manifold plenum" has failed internally. When this happens, coolant fills the lower
intake manifold and cylinders. This causes what is called a hydrostatic lock and the engine wont
crank over.

The upper plenum and gaskets will need to be replaced, as well as the
spark plugs, and the
cylinders will need to be cleaned out.

1992 Buick Lasabre.
The ECM was replaced and the car started and worked fine for one day and now it will not start.
What causes the ECM  to go bad?

The problem seems to be the ECM but what is causing the ECM to go bad?

Answer: Answer: The are a few things that can cause the computer to go bad. Usually a shorted
solenoid. There are several that control different emissions systems on your Buick. The problem
is you would have to test each one with an
ohm meter to see if it is shorted internally.

The other possibility is a shorted wires. There is a large harness that goes down by the back of
the alternator. Check that for a shorted wire.

2002 Buick Lesabre cylinder head gasket replaced. Changed thermostat to 160.
What is the temperature reading on the gauge ..My reads past half . maybe 1/8 past half..is that

A little past full at an extended idle in hot weather is normal. If it goes that far all the time and does
drop, then go back up, then you have a problem. If it is always about there, not something to
worry about. Could have slight restriction in radiator.
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Buick Lesabre Leaking Coolant