1990 vw Corrado g60 210k miles. My car overheats because the thermo fan switch doesn't kick in at low speed. I bought a new termo switch and still th same. You start the car and temprature start rising untill 210 degrees Farenheit and then the fan kicks in. Is there a way to check the low connection to the thermo switch. My switch has 3 pins. Any ideas will be appreciated, thanks Joe.