What is the reason for no warm air in BMW 5 Series?
2 Answers
If there is no warm air in BMW 5 Series, it may be an operation issue. You need to adjust the air outlet control button to the red position. There is no need to turn on the air conditioning. Simply press the air blower button and then increase the temperature. Precautions for using car air conditioning warm air are as follows: 1. The warm air should not be blown directly at the head. Blowing warm air at the head for a long time can cause driver fatigue and affect driving safety. It is recommended to open the window slightly for air circulation when using the heater for a long time to ensure the oxygen content in the car and keep the driver alert. 2. Do not keep the heater on when sleeping in the car, as it can easily cause carbon monoxide poisoning. 3. After turning on the heater, the car becomes a closed space, which provides a good environment for bacterial growth and spread. If someone smokes in the car, the amine and nicotine in the smoke will adhere to the surface of the evaporator. When the air conditioning is not used frequently or in rainy weather, bacteria will spread extensively on the surface of the evaporator, causing air pollution in the car when the air conditioning is turned on again.
I've worked in the auto industry for over twenty years and dealt with numerous BMW 5 Series heating issues. The most common problem is insufficient coolant or air bubbles, which prevents heat from reaching the heater core. Thermostat failure is another major culprit – if it gets stuck in the open position, the engine coolant won't reach proper temperature, and the heating won't work. Heater core clogs are also frequent, where accumulated debris restricts water flow. Electronic control unit issues can interfere too, especially when temperature sensors give false readings. The heating system relies on all these components working together – one malfunction throws everything off. I recommend owners first check coolant levels for leaks and try bleeding air bubbles. Don't attempt DIY fixes; replacing a faulty control unit can be expensive and time-consuming. Driving without heat in cold weather is dangerous, so getting professional diagnosis and repair early is best.
