Please help. My mk4 golf tdi 130 has the small fan going as soon as the engine is started and the temperature stays at about 70 always used to be about 90 plus I seem to be using more fuel. Brought a new thermostat and getting a new temp sensor from vw tomorrow I got 1 from eBay and it didn't seem to make a difference is there anything else it could be other than these 2 things. Thanks Emma.