I had a radiator and the neck was bent so the cap wasnt holding pressure on the bottom seal of the cap. I tore myself up over this but i ended up getting a used radiator off an f4i put my fan on it bolted it up flushed the old stuff out put new peak 50/50 in it and fixed the problem. Ive heard of people putting their thermostat in boiling water on the stove and seeing if it opens up to see if its working properly. KNOWING TEMPERATURE OF BOILING WATER IS KEY. Let me know if anyone has any questions i can help with thanks

 

Hi my 2005 f4i has the Fi light on then it runs the coolant out after it's warm up. Any help with me fixing it. I put in new plugs new battery new neutral switch as well. Thanks