I have a 1999 durango with the 5.9 V8 and it has 90,700 miles. I got a new fan belt last summer and through the winter it squeaked loudly when the engine was running. Mechanic checked it in january and said it was ok. A month later I had the belt replaced along with the harmonic balancer and had the auto tensioner checked. It solved the problem but now a few weeks later the belt squeals when I hit the gas and grinds occasionally at a stop light. Any thoughts on what I should do?