RepairPal Certified shops can diagnose and repair your 2011 Ram 3500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Ok .. Does 'COLD AIR' start blowing out as well ? ... Keep in mind the air conditioner compressor will also engage 'by default' when certain HVAC settings are selected - even in the heat mode.
Reference owners manual.