Mercedes-Benz bulletin LI83.20-P-079559
What it saysComplaint No cooling output, compressor inoperative. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Jul 18, 2025, received Jul 24, 2025, about the visibility/wiper. It names 16 model years (2017–2024). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationComplaint No cooling output, compressor inoperative. Cause Currently under analyzed. Remedy Please create a TIPS case and provide the following information: -Provide the refrigerant filling capacity -Current actual values from XENTRY (compressor values) -Has there previously been work on the refrigerant circuit in the vehicle? -Check air conditioning system for leak tightness as per WIS -Document results and possible leaks in TIPS case
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI83.20-P-079559 | Service bulletin | Jul 18, 2025 | 11020874 | PDF, 35 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 16 model years this bulletin names have filed 439 complaints with NHTSA since 2015.
I own a 2022 Mercedes-Benz E350. The front glass roof panel located directly above the windshield developed a large crack while the vehicle was parked. The crack extends nearly the full length of the panel and includes areas where the glass has separated along the fracture.
2022 Mercedes-Benz E-Class · Visibility/Wiper · filed with NHTSA Jul 22, 2026
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the visibility/wiper
Source: same model, same component group10 other manufacturer communications filed against these Mercedes-Benz models under the same component group (visibility/wiper), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI83.90-P-080935 | Service bulletin | Sep 25, 2026 | Complaint CEL illuminates and/or AC does not blow cold. Cause Potentially relevance to hardware and/or software Remedy Scenario 1: 1. If the… |
| LI83.55-P-080937 | Service bulletin | Sep 1, 2026 | Cause Internal failure of the scroll wheel within the AC compressor. Remedy Check the compressor's index and part number Figure 1 against Ta… |
| PSL-NCU Return Parts 6/19 | Other | Jun 19, 2026 | Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be ret… |
| LI82.30-P-059239 | Service bulletin | May 19, 2026 | Complaint There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper blades squeaking, chatteri… |
| LI77.21-P-080504 | Service bulletin | May 18, 2026 | Complaint The panoramic sliding sunroof operates in a stepped movement. The panoramic roof becomes denormalized without an apparent reason… |
| LI83.70-P-080411 | Service bulletin | Apr 13, 2026 | Complaint No heating output is available during electric driving operation. In conventional (combustion engine) driving operation, full heat… |
| LI72.40-P-071889 | Service bulletin | Apr 7, 2026 | Complaint When closing the door, the side window may remain slightly open (short stroke position). Automatic window raising function of side… |
| LI83.30-P-079850 | Service bulletin | Jan 16, 2026 | Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy *… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Mercedes-Benz, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mercedes-Benz LI83.20-P-079559 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the LI83.20-P-079559 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does LI83.20-P-079559 cover?
The manufacturer filed it against 16 model years: 2024 Mercedes-Benz AMG GT, 2023 Mercedes-Benz AMG GT, 2022 Mercedes-Benz AMG GT, 2021 Mercedes-Benz AMG GT, 2020 Mercedes-Benz AMG GT, 2019 Mercedes-Benz AMG GT and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.