I have a code 3 on my car it pops up after 20 mins in from driving. I have just had the water pump changed there is no leak but still getting code. The coolant doesn't seem to return to expansion tank all the time. Thinking maybe sticky thermostat any help would be much appreciated. Feel like im going round in circles.
Car: Vauxhall Insignia Variant: 1.8 petrol Model Year: 2011