2016 BMW 640i Gran Coupe AC Isn't Working

Common Causes of AC Issues in Your 2016 BMW 640i Gran Coupe and How to Resolve Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
37% chance it's the
Refrigerant Leak
0%
21% chance it's the
Climate Control Electrical Issue
0%
12% chance it's the
AC Compressor
0%
30% chance it's
Something else
The most common reasons a 2016 BMW 640i Gran Coupe AC isn't working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.
  • Refrigerant Leak: A refrigerant leak can occur due to damaged hoses, seals, or connections, resulting in decreased cooling efficiency in the air conditioning system.
  • Climate Control Electrical Issue: A faulty climate control module or a short circuit in the wiring can disrupt the electrical signals needed for proper operation of the climate control system.
  • AC Compressor: A faulty AC compressor may be due to a lack of lubrication, electrical issues, or internal mechanical failure, resulting in inadequate cooling performance.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the common problems that could cause the AC to stop working in a 2016 BMW 640i Gran Coupe?

When the air conditioning system in a 2016 BMW 640i Gran Coupe ceases to function, it can be frustrating, but understanding the common problems can help in diagnosing the issue. One prevalent cause is a refrigerant leak, which can occur due to wear and tear on the AC components, leading to insufficient refrigerant levels and reduced cooling efficiency. Another potential issue is related to the electrical climate control system; if there are faults in the wiring or control modules, it can disrupt the operation of the AC, preventing it from cooling the cabin effectively. Additionally, problems with the air conditioning compressor, which is responsible for circulating the refrigerant, can also result in AC failure. If the compressor is malfunctioning or has seized, it will not be able to pressurize the refrigerant, leading to a complete loss of cooling. By identifying these common issues, DIYers can take the first steps toward troubleshooting and potentially resolving the AC problems in their BMW 640i Gran Coupe.

How urgent is it to address the AC failure in my 2016 BMW 640i Gran Coupe?

Addressing AC failure in your 2016 BMW 640i Gran Coupe should not be taken lightly, as neglecting this issue can lead to a cascade of problems that affect both your comfort and the vehicle's performance. While it may not seem like an immediate emergency, a malfunctioning air conditioning system can result in more than just discomfort during hot weather; it can also indicate underlying issues such as a failing compressor or refrigerant leaks. These problems, if left unresolved, can escalate into costly repairs that could have been avoided with timely intervention. For DIY enthusiasts, it’s crucial to recognize the signs of AC failure early on, such as unusual noises or warm air blowing from the vents, and to take proactive steps like checking refrigerant levels or inspecting for leaks. Regular maintenance, including changing the cabin air filter and using the recommended refrigerants, can also enhance system efficiency and prolong the life of your AC unit. Ultimately, addressing AC issues promptly not only ensures a comfortable driving experience but also safeguards your investment in the vehicle.

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