Yesterday I put a good part of my day into taking the next steps of having my Arduino power the cooling fan for my truck. This will likely be the same Arduino that will be the remote start too assuming it can handle multiple operations.  In the video below I demo the functional logic of the circuit with features an automatic temperature based control and a manual push button for those occasional 100* F Summer days. The next step is to wire this circuitry into the existing fan relays and remove the previous circuitry I built. I have nicknamed this project and the Remote GSM Car Starter the S10Duino.