2001 Chevrolet 2500 HD 6.0L Strong coolant smell. Coolant seems to be leaking from the front of the engine. Oil is not milky. Is this a water pump problem, gasket problem or both? 116,000 miles I have searched other threads already and wanted to start my own, specific to my problem. I will be taking it to the mechanic this week. Just wondering what it might be and the approximate cost to fix.