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2020 E350 A/C Blowing Warm - DIY Recharge or Bigger Problem?

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Chris P. · rep 0 · May 22, 4:18 AM · 1 replies · solved · Question

Vehicle: 2020 Mercedes-Benz E350

Hey everyone,

My 2020 Mercedes-Benz E350 (W213) has decided to stop blowing cold air. It's been getting progressively warmer over the last few weeks, and now it's just ambient temperature. The fan works fine, and I don't hear any strange noises from the compressor area. The car has about 45,000 miles on it.

I'm wondering if this is just a simple case of low refrigerant and if I can try one of those DIY A/C recharge kits. Or, given it's a newer Mercedes, is it more likely to be a sensor, a leak, or something more complex that requires a professional? I haven't seen any warning lights on the dash.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:18 AM

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Hi Chris,

It's frustrating when your A/C stops working, especially in a newer vehicle like your 2020 E350. While low refrigerant is a common cause, a DIY recharge kit might not be the best first step for a modern Mercedes-Benz for several reasons.

Here's a breakdown of potential causes and recommendations:

  1. Refrigerant Leak: The most common reason for warm A/C is a leak in the system. Modern A/C systems are sealed, and refrigerant doesn't 'get used up.' If it's low, it means it leaked out. Simply adding more refrigerant without finding and fixing the leak is a temporary solution and can be wasteful.
  2. DIY Recharge Kit Concerns:
    • Overcharging: It's very easy to overcharge the system with DIY kits, which can damage the compressor or other components.
    • Incorrect Refrigerant: Your E350 likely uses R-1234yf refrigerant, not the older R-134a found in most DIY kits. Using the wrong type can cause serious damage and is illegal in some areas.
    • No Leak Detection: These kits don't help you find the source of the leak.
  3. Other Potential Issues:
    • Compressor Failure: While less common at 45k miles, a failing compressor clutch or the compressor itself could be the issue.
    • Pressure Sensor: A faulty A/C pressure sensor can prevent the compressor from engaging, even if the refrigerant level is correct.
    • Blower Motor/Resistor: Though you mentioned the fan works, sometimes these can cause issues with airflow or control.
    • Electrical Issues: Fuses or relays related to the A/C system.

When to See a Shop: Given the complexity of modern Mercedes-Benz A/C systems and the specific refrigerant used, we highly recommend taking your E350 to a qualified Mercedes-Benz specialist or dealership. They have the proper equipment to:

  • Diagnose the Leak: Using specialized leak detection tools.
  • Evacuate and Recharge: Properly evacuate the old refrigerant and moisture, then recharge with the correct type and precise amount of R-1234yf.
  • Check Components: Test the compressor, pressure sensors, and other electrical components to pinpoint the exact cause of the problem.

This approach ensures a correct and lasting repair, protecting your A/C system from further damage.

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