Today I installed the Autofan Kit for the Coleman Mach roof a/c. It cycles the fan with the compressor so you don't have that noisy fan running non-stop. It was a breeze to install. I purchased the kit on Amazon for $34.95+ shipping. I did it in about 30 minutes with 1 phillips screwdriver and a needle nose pliers. The instructions aren't great, but if you read through them once before you start and then follow them step by step, they work. I now have beautiful silence!!!