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I have a 97 Tahoe with the 5.7 Vortec engine and the coolant temp sensor is located on the drivers side of the block, just about 1/3 way back in line with the spark plugs. It has an electrical connection that runs up to close to the throttle bottle. I thought mine was bad becasue my temp gauge seems to always show @ 160-170 and I put in a 192 degree thermostat. Why they take the engine temp sensor from the side of the block I have no idea. An easy way to check to make sure you have the right sensor..........run the engine to temp, disconnect the electrical connection and see if the temp gauge goes down , reconnect and it should go up.

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