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DIY Swamp Cooler Service, Troubleshooting & Replacement Parts If you own a residential evaporative cooler (swamp cooler), regular maintenance is not optional. Because of hard water, dust, and mineral buildup, evaporative coolers are high-maintenance systems. The good news? Almost everything can be serviced by a homeowner with basic tools. This comprehensive DIY evaporative cooler maintenance and troubleshooting guide will help you: • Start up your cooler properly each season • Clean mineral bui …