What is the method for bleeding air from a BMW radiator?
3 Answers
In a cold engine state, open the engine compartment and check if the coolant is sufficient. Inspect all connecting pipes for gaps or signs of leakage. Replace the antifreeze, then start the car and let it run for 10 minutes. If the liquid level drops, it indicates that the air has been purged. Below is some related information about BMW: 1. BMW is one of the three major German luxury car brands. 2. BMW's lineup includes the BMW 1 Series, BMW 2 Series, BMW 3 Series, BMW 4 Series, and the M Series, which is an improved version based on each series. Among these, the 1 Series is a compact car, the 2 Series is a small coupe, the 3 Series is a mid-sized car, and the BMW 3 Series is one of the most important series under BMW.
DIY bleeding the BMW radiator air is actually not difficult, don't rush to open the radiator cap. As a car repair shop owner, I recommend waiting until the engine is completely cooled, like overnight or at least parked for several hours. Find a small wrench, see that screw next to the radiator overflow tank? Yes, that small plastic knob. Put a cloth underneath when loosening it to prevent splashing. This requires two people to cooperate - one starts the engine and holds the RPM at 2000. Watch if air bubbles come out from the knob opening, when it sprays continuous bubble-free water flow, it's done. Keep an eye on the temperature gauge during the process - don't let it overheat! After finishing, remember to top up coolant to the standard level. For older cars, also check if hoses have aged or leaks.
The last video I made on Douyin about bleeding the cooling system went viral. Here's a little trick for BMW owners. First, prepare a bottle of distilled water and keep it nearby. Open the cap of the auxiliary water tank to let it breathe. Locate the heater hose at the rear of the engine and squeeze it a few times with your hand—if you hear a gurgling sound, there's air inside. Here's the key: After starting the engine, turn the air conditioning to the highest heat setting and set the fan to maximum. At this point, the engine RPM will increase on its own. Wait about ten minutes until the coolant temperature stabilizes around 90 degrees. Feel both ends of the heater hose—they should be roughly the same temperature. If one end is cold and the other hot, it means there's still air in the system. This method is effortless and requires no special tools, so even female owners can do it themselves. Finally, remember to top up the coolant to the MAX line and check the water level again after driving for a couple of days.
