hi i've got a 1990 190e 2.0 petrol and the heater does not seem to get very warm, so far i have flushed the matrix and its clear and i have also replaced the thermostat, the car runs at normal operating temp 80-90 and stays there. is there any common problems with the 190 models. i have also got a loud creak when steering and over bumps i think its coming from the lower front ball joint is this another common problem ?.