Water running temp is cold


Hi I drive a 1.4 TDi which I have had for 15 years and fast approaching 300K.

The water temperature gauge beauty moves from 60. and the heater does get warm but I remember it hotter! When I am stuck in traffic slowly the water temp gauge creeps up to 90 and then the electric cooling fan comes on, as it should.

I have changed the thermostat and it worked properly straight away, but in less than two weeks it was back to running cold.

Scratching my head on this?