Please Help? I am new to this. I have A 96 C 220 that is great. But the car seems to be running hot. The temp guage stays around 80 degree mark. Then rises to around 90 to 95 when at iddle or at a red light. How about a colder thermostat. Also there seems to be a rattle noise under the hood. But goes away when in neutral. It looks like a shock on the front of motor, some type of belt tensioner or motor mount. Any help would be great. Thanks