Thanks fro the feedback. I had seen this at the Pimoroni site “Because Fan SHIM uses pin BCM18 to control the fan, and this pin is also used by I2S audio devices, you won’t be able to use I2S DACs like pHAT DAC, pHAT BEAT, and the IQAudio boards at the same time as Fan SHIM” and thought there might be an issue. I’ll try heat sinks first and if there is a heat problem I’ll bypass BCM18 and hardwire the fan ON and not use the fan software.