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Follow the radiator hose to the engine. It goes to the thermostat housing. At the throttle body, look to the left of the housing, down it the hole is the temp sensor. You'll see the wires running to it.
SOUND LIKE FAULTY OPEN ENGINE COOLANT TEMPERATURE SENSOR. HAVE CAR HOOK TO CODE SCANNER WHERE YOU CAN SEE ENGINE COOLANT TEMPERATURE. IF ENGINE HOT AND CODE SCANNER SHOW LOWER TEMPERATURE LIKE 100 - 80 DEGREES ECT IS BAD.
On the Buick Le Sabre the MAP sensor is located near the front of the engine. As you face the engine from the front, it's on top of an approximately 3 inch high tube near the bank of coils. The tube houses the PCV valve. The MAP sensor is on top of the tube..
They are almost always located on the bottom tank of the engine's radiator.
They can have one or two wires (some are grounded to the tank and require only one) and are generally cylindrical with a hex section near the mounting surface to installation and removal.
You will need to catch the coolant when removing it and don't forget, it's a pretty large quantity of liquids.
When I have been in doubt whether one was defective or not, I have attached leads to monitor continuity and heated them in a container on the stove with a candy thermometer in the same water to watch the temperature rise.
If OK, they should contact at some value below 212 degrees F.