accessory belt idle pulleys?
This past week the pulley on my belt tensioner broke. When the pulley broke the belt came off and the engine overheated immediately. The 'volts' light came on, on the dash and I saw the temperature gauge moving into the red zone. I was going 70 mph on the highway. I shifted into neutral and turned off the ignition and coasted off the exit ramp. When I went to the parts store to get a replacement part I was told that the plastic pulley that was on the car was superseded with a steel pulley because the plastic pulleys were prone to failure. I installed the steel pulley and everything was fine. I have driven it 500 miles since and I seemed to have avoided any permanent damage.
I noticed when making the repair that the supercharger belt has three similar plastic pulleys. So my question is; are these plastic pulleys something I should replace with steel before I have another failure and risk permanent engine damage?