Dear BL: ENGINE RECENTLY STARTED TO OVERHEAT. I ADDED ABOUT
A LITRE OF WATER DIRECTLY INTO THE RADIATOR. I WAITED APPROXIMATELY 20 MINUTES,
THEN I TOOK THE CAR FOR A RIDE. THE TEMP GAUGE STAYED WITHIN NORMAL LIMITS,
UNTIL I STOPPED. THE TEMP GAUGE CLIMBED INTO THE RED ZONE WHEN I LET IT IDLE.

COULD THIS PROBLEM BE THE WATER PUMP OR THERMOSTAT?
BY THE WAY, WHERE IS THE THERMOSTAT LOCATED ON THIS ENGINE? 3.1 LITRE  
ANY HELP WOULD BE GREATLY APPRECIATED. THANKS

Answer:
It could be a t-stat sticking. These engines known for lower intake gaskets leaking internally and
externally. Also the rear headgasket for leaking externally, or allowing combustion into the cooling
system. Temp. Gauge normal while driving, but overheating at idle could also be cooling fans not
running, or a restriction in the cooling system- mainly the radiator.
The t-stat is inside the housing that the upper radiator hose is attached to. It is under the exhaust
crossover, held on with two 13mm bolts and is difficult to reach. Removing the throttle body helps.
Common areas of coolant leak on the 3.1L and 3.4L GM v6 engine.
1- thermostat inside housing. Pic with throttle body and exhaust crossover removed.
Other related questions
94 OLDS CUTLASS SUPREME. 3.1 V6
Warning lights = YES
question = WHAT'S THE PROPER WAY TO FILL A COOLANT SYSTEM TO WHERE THE
LOW COOLANT LAMP DOES NOT LIGHT. I FILL IT TO WHAT I THINK IS THE PROPER WAY
BUT THE LIGHT STILL REMAINS ON. SOME VALVE NEAR THE THERMOSTAT HAS TO BE
UNSCREWED TO WHERE YOU SEE THE COOLANT REACH ITS PROPER LEVEL?
Answer:
The screw you mention that is on the coolant bypass pipe is for bleeding the air out of the
system only, not to check the level or set the level. If you're just adding coolant to top off, you
don't need to loosen that screw. If the system is empty or extremely low, it is best to open up
that screw while you add coolant to help bleed the air from the cooling system. If you're low
coolant light stays on after you've topped off the system, you've probably got a bad coolant
level sensor. It would need to be replaced then to fix your problem.


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Cutlass Supreme Thermostat Location