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Hello, the engine coolant temperature sending unit and engine coolant temperature sensor are both located in approximately the same area - above the water pump pulley area of the front of the engine.
Additionally OBD 1 trouble code 21 is related to the TPS (Throttle Position Sensor) / circuit..
The CTS (Coolant Temperature Sensor) trouble codes are 14 OR 15 ..
Your question is about the “coolant temperature sender†would be temperature ‘gauge’ related.
A professional scan test while the engine is COLD will make short work of diagnosis!
Additionally OBD 1 trouble code 21 is related to the TPS (Throttle Position Sensor) / circuit.. The CTS (Coolant Temperature Sensor) trouble codes are 14 OR 15 .. Your question is about the “coolant temperature sender†would be temperature ‘gauge’ related. A professional scan test while the engine is COLD will make short work of diagnosis!