2016 Mercedes-Benz GL350 Heater Isn't Working

Common Causes of Heater Issues in Your 2016 Mercedes-Benz GL350 and How to Resolve Them

Find Repair Location
Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
31% chance it's the
Heater Blower Motor
0%
18% chance it's the
Heater Blower Motor Resistor
0%
51% chance it's
Something else
The most common reasons a 2016 Mercedes-Benz GL350 heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
  • Heater Blower Motor: A faulty heater blower motor can result in inadequate airflow or no air circulation in the cabin, affecting the heating system's performance.
  • Heater Blower Motor Resistor: A faulty heater blower motor resistor can cause inconsistent fan speeds or complete failure of the blower motor.
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 steps should I take to diagnose the heater issue in my 2016 Mercedes-Benz GL350?

When diagnosing a heater issue in your 2016 Mercedes-Benz GL350, it's crucial to follow a structured diagnostic approach that emphasizes simpler checks before moving on to more complex solutions. Begin by assessing the thermostat, as a malfunction here can greatly affect your vehicle's heating efficiency. Next, check the coolant level; insufficient coolant can lead to poor heating performance, so make sure it meets the recommended level. After that, inspect the heater core for any clogs or leaks, as these can significantly impair heating capabilities. It's also important to test the blower motor to ensure it is operating correctly, since a faulty blower can disrupt the flow of warm air. Keep an eye out for any leaks in the system, as they can lead to heat loss. Finally, using a diagnostic tool to scan for error codes can help identify specific issues within the heating system. By systematically following these steps, you can effectively diagnose and resolve the heater issue in your vehicle, ensuring a comfortable driving experience.

What are the common problems that could cause the heater to stop working in a 2016 Mercedes-Benz GL350?

When troubleshooting a non-functioning heater in a 2016 Mercedes-Benz GL350, it's essential to consider several common problems that could be at play. A faulty thermostat is often the first suspect, as it regulates the engine's temperature and can prevent warm air from circulating if it fails. Additionally, low coolant levels can significantly impact the heater's performance, as insufficient coolant means there isn't enough fluid to absorb heat and distribute it through the system. Another critical component to examine is the heater core; if it becomes clogged or develops leaks, it can obstruct the flow of hot air into the cabin. Furthermore, the blower motor plays a vital role in pushing warm air through the vents, and any malfunction here can lead to inadequate heating. Lastly, the heater control valve, which manages the flow of hot coolant into the heater core, can also fail, disrupting the heating process. By systematically checking these components, DIY enthusiasts can effectively diagnose and potentially resolve the heating issues in their vehicle.

How urgent is it to repair the non-functioning heater in a 2016 Mercedes-Benz GL350?

Repairing the non-functioning heater in a 2016 Mercedes-Benz GL350 is an urgent matter that should not be overlooked. A malfunctioning heater compromises comfort, especially during cold weather, making driving an unpleasant experience. Moreover, the heater is integral to defrosting the windshield, which is crucial for maintaining visibility and ensuring safe driving conditions. Ignoring these issues can lead to more significant problems, as a faulty heater may indicate underlying issues with the vehicle's cooling system, potentially affecting engine performance. Additionally, neglecting heater repairs can diminish the vehicle's resale value, as prospective buyers often look for well-maintained features. Therefore, addressing heater issues promptly not only enhances your driving experience but also protects your investment in the vehicle. For DIY enthusiasts, tackling this repair can be a rewarding project that ensures both safety and comfort on the road.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2016 Mercedes-Benz GL350 Heater Troubleshooting Guide