intake manifold...or therabouts...but everyone should have a manual for their vehicle, and a professional shop manual should be available at the library in the reference section--you can make copies of the necessary information...good luck :)
at the thermostat housing. follow the upper radiator hose you'll run right in to it.
Assuming this is a 4.3L engine the ect (engine coolant temp sensor) would be located next to the thermostat housing.
There are two separate sensors that play here. the "coolant temperature sensor" and "coolant LEVEL sensor". I suggest confirming which of these was replaced, as it is very common for them to be confused. likely you will find the coolant sensor that was replaced was the one on the engine (temperature); The LEVEL sensor is mounted either in the coolant resivoir or in the radiator. Probably just need the proper sensor replaced.
It is in the driver side head up front in the middle of the first 2 spark plugs.
This censor is located behind the grill. On the drivers side of this vehicle behind the grill and in front of the radiator.
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Either there's a problem with your sensor, or there's a problem with your thermostat, and it's giving a false reading. Your engine temp may actually be high, as well - what you see on the gauge is the temperature of the coolant, not of the block itself.
o2 censor
The Sensor that is located after cat. converter on side of engine with evenly numbered cylinders.
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