Coolant Temperature Sensor Problem- Please help

In a nutshell, its overheating. There is no temp gauge fitted, just a red light that comes on when its too hot. It happens at slow speed. Perfectly fine on motorways. Not leaking any coolant. If the light comes on around town, it will go off again with a bit of driving and airflow.

We have tried just about everything so far and I am stuck. This is what has been done so far.

  • Sniff test completed. Head gasket is ruled out.
  • New radiator cap fitted.
  • New thermostat fitted
  • Water pump removed and inspected. Perfect working order.
  • Fan working correctly and switching between both speeds.
  • Heater in car works perfect so the matrix is ruled out.
  • Radiator was removed and tested by professionals.
 
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