k i have a 2001 audi tt mk1 225 and having some overheating problems the fans wont turn on unless i turn on my a/c. with out the a/c the car will over heat any ideas what it can be. thanks

 

Well the fan usually doesn't need to come on unless the a/c is on. Im thinking your water pump isn't pushing the correct amount of coolant through the radiator. Feel the hoses! Does the hose temperature feel the same going into the radiator as it does coming out?