Learn how to check coolant level on BMW 3-Series 2004-2013.
Locate the hood release underneath the dashboard of your BMW 3-Series Pull the lever until you hear the BMW hood pop open. Next, you need to release the hood safety latch at the front of your 3-Series.
Lift up the hood and secure it in the open position.
Next, you locate the coolant reservoir (tank) on your BMW. This is where you can check 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. Open the cap only when the engine has cooled down.
Remove cap. Look at the coolant reservoir tank and note the low and high level. If the level is below the minimum mark you will need to add coolant or your 3-Series may overheat. BMW 3-series uses the floating device to determine coolant level.
Add engine coolant/antifreeze. Only add coolant type recommended by BMW.This guide applies to BMW 316i, 318i, 320i, 323i, 325i, 325xi, 328i, 328xi, 330i, 330xi, 335i, 335is, 335xi, 320d, 320xd, 325d, 330d, 330xd, 335d, M3, and M3 GTS.