The fan went out really fast for me. my amp was mounted vertically with the fan on the bottom in the trunk in a 03 bmw 530i in the compartment for the stock amp. i must have had the pos and neg speaker wire touching recently when i disconnected the subwoofers. now the amp doesnt go into protect mode it shows its on and powered but doesnt output any sound. i surely thought that the protection circuitry in the amp would have gone off and not allowed that to happen. I have it out of the car now and am currently going to start diagnosing it. hopefully it can be saved..