Where is the tempeture sensor located on a 99 grand marquis
Sending units can be difficult to diagnose, since they sit somewhere between the sensors themselves and the temperature gauges (they may even be part of the sensors themselves, making diagnosis even more difficult). How do you know if the problem lies in the gauge itself, the sensors or the sending unit? You can always check the sensors themselves---one of the most common problems with temperature sensors located near the engine is a disconnection caused by vibration, which dislodges the sensor. If the sensor is dislodged, you can fix this problem and the sending unit should operate well.
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