Hello team my vw polo coolant tank is boiling but the temperature is normal any help?

Is it boiling or is it bubbling because it’s pressurising?

Boiling like water in a kettle 

Do you have pressure in the hoses or cold spots in the lower coolant hose. Have you checked your oil for contamination from a head gasket issue. The other item I’d look at would be water pump. 
do you have heat from the heaters? 

Edited 4 April, 20215 yr by UndertheRadar

I haven't check the lower pipes the oil is ok i check yes for heaters are working the is pressure in pipes but i end up removing a thermostat but it's still the same 🙆‍♂️