We Found COOLANT in the High-Voltage System… This BMW 5 Series Nearly Destroyed Itself!

This BMW 5 Series G-Series (Hybrid) came in with what looked like a simple AC problem… But what we uncovered was one of the most dangerous failures possible in a high-voltage system. Coolant had entered the AC high-voltage circuit — contaminating the compressor, pipes, dryer, evaporator, and even the battery cooling loop. In this video we explain: ⛔ Why coolant inside a high-voltage AC system is catastrophic ⚡ How the isolation test revealed hidden electrical danger 🔧 Why incorrect repair procedures made the issue far worse 🚗 The risks to the inverter, compressor and HV battery 📘 How the BMW 5 Series hybrid cooling architecture works 🔥 What needs replacing — and what might still be saved This is one of the most extreme BMW 5 Series hybrid AC failures we’ve seen — and a serious warning for all hybrid/EV owners. 📍 Visit Us: OGS Mechanics Units 9–14, Millers Yard Rear of 28 Long Lane London N3 2QG 📺 Watch Our Repairs in Action: 📌 Subscribe on YouTube → Weekly EV/Hybrid breakdowns, fixes & full diagnostics 📲 Follow the Behind-the-Scenes Garage Life: 🎵 TikTok: https://www.tiktok.com/@ogsmechanics 📸 Instagram: https://www.instagram.com/ogs_mechanics 📘 Facebook: https://www.facebook.com/share/15J54KFwjE/?mibextid=wwXIfr #BMW5Series #BMW530e #BMWHybrid #OGSMechanics #EVRepair #HybridRepair #HighVoltageSystem #ACFailure #ElectricVehicleTech #BatteryCooling #MechanicLife