Loss of coolant; Engine overheating; The engine’s coolant regulates the temperature of the engine, preventing it from becoming too hot. Without it, the metals in the engine can expand, warp, and crack. No engine should run without coolant. If the inlet only has a small crack, the coolant can slowly leak out, while air can get into the cooling In this article, I will go over the steps involved with replacing the engine coolant on the BMW M52 and M54 engine. Be sure to work with a cool engine and confirm the cooling system lacks pressure before opening the cooling system. If you are looking for more Technical Articles to diagnose or repair cooling issues please visit our E46 page. Lift the hood and secure it in the open position. Locate the Coolant Reservoir. Next, you locate the coolant reservoir (tank) on your BMW. This is where you can check the coolant level and add coolant if the level is low. On a 3-Series, the coolant expansion tank is located on the passenger side of the engine. Open the cap slowly. The coolant has to be cold and you CANNOT fill it over the “max” float level in the big tank in the back. If it’s overfilled at all it will vent out of the cap or you spill any it will run down the drivers side of the engine and fail your pencil style injectors. Reply Quote. In this video I show you the steps needed to replace the oil filter housing gasket and oil cooler gasket on a BMW with the N51 or N52 engine. I show you step The 7 series BMW'S are known for a series of coolant leaks,heres the coolant i traced down,it was tuff to find on this 8 cylinder beast because this motor is Model Engine BMW�X5�xDrive40i�(G05),�from�07/2018 B58B30M1 BMW�X7�xDrive40i�(G07),�from�12/2018 B58B30M1 B58TU�Engine 4.�Cooling�System Solution: This is potentially an easy fix. Simply top up your coolant to the “Max” or “Full” level when the engine is cold. Use a 50/50 coolant-and-water mix, as specified in your owner’s manual. For the next week, check your coolant level frequently (with a cold engine), to be sure that there is no ongoing leak that requires regular ohfDNDD.