1997 Acura Rl Temperature Gauge Always Stayed Mid Line Between Hot Cold Last

1997 ACURA RL
190,000 MILES
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The temperature gauge has always stayed mid-line (between hot and cold). The last couple of days I have noticed that periodically while driving on the highway the gauge drops below the cold mark and stays there until I reach the city and then it runs normal.

Heater still produces heat and to date no overheating or other issues. Does this sound like a thermostat problem?
Nov 28, 2012 at 4:15 PM
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KHLOW2008
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Yes, it is possible the thermostat is stuck in the open position. Before you replace the thermostat, check and ensure the sending unit wire is clean and secure.
Nov 28, 2012 at 4:41 PM
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