Running cold

[2timer]

Hi guys,

My 2.0 mk3 is giving me some grief at the moment, at idle it will get up to temp no problem but when I get going the temp drops to just under a quarter, I'm use to it being around half regardless of the ambient temp.

Any ideas, thanks.

Pete

[ffoff]

depending on the outside temperature and driving conditions, my mk3 barely hits half way these days.

[2timer]

yeah, but it sucks when the engine is cold so is the heater

[Domel]

Thermostat stuck open?

[Lucas_R]

Thermostat stuck open?

This is most likely the issue. Thermostat is probably stuck open, which allows the water to flow constantly through then engine block - so when driving, the water wont get up to temp.