Coolant warms up much slower

[Sylvester]

I've noticed it takes +50% time for the engine to reach operating temperature. I know its a bit colder now , but it happened from one day to another. Thermostat problem? HCV was changed 1-2 months ago and working great. Thanks.

 

[Major Malfunction]

I've also noticed that it takes ages to get warm if the heaters are on and its cold outside. I guess this makes sense as the heater is essentially acting as another radiator, so I'm not too worried about it

 

[alfie74]

id say the thermostat, you can test it buy putting it in boiling water to see if it opens ok