Fix MrCool 12K DIY Mini Split Not Cooling | Add R410A Refrigerant (Step-by-Step Repair Guide)

📝 Description

Is your MrCool DIY 12K mini split not cooling properly or frosting up? In this video, I’ll walk you through exactly how to diagnose and fix the problem by safely adding R410A refrigerant. You’ll learn how to: Identify refrigerant type on your MrCool outdoor unit Use R410A refrigerant with UV dye & sealant for leak detection Connect and charge your mini split system safely Avoid common mistakes (like connecting to high pressure side) Confirm the repair with thermal imaging and frost removal ⚠️ Safety First: Always wear gloves and safety glasses when handling refrigerant. Work in cooling mode only and follow all manufacturer guidelines. Timecode 0:00 Intro – MrCool 12K DIY Mini Split 0:18 Check refrigerant type (R410A) 0:52 Why use R410A with UV dye & sealant 1:50 Safety gear (gloves & glasses) 2:09 Connector setup & gauge explanation 3:00 Cooling mode & low-pressure side 3:40 Frost on refrigerant line = low charge 4:09 Adding R410A refrigerant (step by step) 5:18 Frost gone – system cooling properly 5:55 Thermal imaging test results 6:45 Before vs after cooling difference 7:06 Final thoughts & where to buy refrigerant