hi can any one help me please my 88 rs turbo the temp gauge reads up on the high side but not in the red !above the n, the fan cuts in and it does not boil over and when you idle the heater in the car goes cold until you hit 3000 rpm then its hot again ,i have tried a new thermostate n sensor but the gauge is still high and the bloody heater is crap any help muchly apreciated as im new to rs turbos thanks