Illustration"CHECK COOLANT LEVEL" LEVEL WARNING SIGN WAS ON. APPARENTLY, THERE IS LEAKING OF COOLANT SOME WHERE. IT WAS AT THE WATER PUMP, WHICH WAS REPLACED ON JUNE 20, 2019. IT HAPPENS AGAIN NOW, ABOUT 9 MONTHS LATER.
2003 Mercedes Benz C320
Owner reports · Recalls · Investigations
Limited comparison data
There is not enough comparable history to draw a useful model-year comparison.
About this comparison →How this year compares
Owner complaints by model year
Compare all C320 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
Limited mileage data: 15 of 22 reports include usable mileage. There isn’t enough coverage to show a useful chart.
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Electrical System. Review the 7 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Power Train. Review the 5 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Air Bags. Review the 4 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
2 crash reports1 fire reports2 injury reports
Power Train complaints
5 reportsI HAVE A 2003 C 320 MBNZ, THE RADIATOR LEAKS INTO THE TRANSMISSION. THE RADIATOR NEEDS TO BE REPLACED. THIS LEAKING RADIATOR FLUID DAMAGED THE TRANSMISSION, AND IT HAS TO BE REPLACED. THIS PROBLEM CAUSED A LACK OF POWER AND THEREFORE A LOSS OF ACCELERATION. IT HAPPENED WITHOUT ANY WARNING, LEAVING YOU VULNERABLE DUE TO THE LOSS …
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I HAVE A 2003 C 320 MBNZ, THE RADIATOR LEAKS INTO THE TRANSMISSION. THE RADIATOR NEEDS TO BE REPLACED. THIS LEAKING RADIATOR FLUID DAMAGED THE TRANSMISSION, AND IT HAS TO BE REPLACED. THIS PROBLEM CAUSED A LACK OF POWER AND THEREFORE A LOSS OF ACCELERATION. IT HAPPENED WITHOUT ANY WARNING, LEAVING YOU VULNERABLE DUE TO THE LOSS OF POWER, A VERY DANGEROUS SITUATION WHICH MAY CAUSE AN ACCIDENT. THE CAR HAS ONLY 50026 MILES ON IT. *TR
2003 MERCEDES C320. CONSUMER WRITES IN REGARDS TO A SAFETY RECALL TRANSFER CASE *TGW THE CONSUMER WAS INFORMED THAT DUE TO THE MILEAGE ON THE VEHICLE, THEY WOULD NOT BE WILLING TO ASSIST WITH ABSORBING SOME OF THE COST FOR THE REPLACEMENT PART. *JB
ON A 2003 C 320 MBNZ, THE RADIATOR NOW LEAKS INTO THE TRANSMISSION. THIS IS GOING TO REQUIRE THE RADIATOR TO BE REPLACED AND FOR THE TRANSMISSION TO BE FLUSHED. THIS LEAKING RADIATOR FLUID COULD HAVE ALREADY DAMAGED THE TRANSMISSION, AND IF SO, IT WILL HAVE TO BE REPLACED. THIS PROBLEM CAUSES A LACK OF POWER AND THEREFORE A LO…
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ON A 2003 C 320 MBNZ, THE RADIATOR NOW LEAKS INTO THE TRANSMISSION. THIS IS GOING TO REQUIRE THE RADIATOR TO BE REPLACED AND FOR THE TRANSMISSION TO BE FLUSHED. THIS LEAKING RADIATOR FLUID COULD HAVE ALREADY DAMAGED THE TRANSMISSION, AND IF SO, IT WILL HAVE TO BE REPLACED. THIS PROBLEM CAUSES A LACK OF POWER AND THEREFORE A LOSS OF ACCELERATION. IT HAPPENS WITHOUT ANY WARNING, OFTEN LEAVING YOU VULNERABLE DUE TO THE LOSS OF POWER, A POTENTIAL ACCIDENT WAITING TO HAPPEN. *TR
I PURCHASE MY 2003 MERCEDES FROM CARMAX IN 2 YEARS AGO. IT HAD 45,000 MILES WHEN I PURCHASED IT. FROM THE TIME I PURCHASE THIS CAR I HAD TO REPLACE THE SUNROOF MOTOR, REPLACE THE SHOCKS, REPLACE THE TRUCK LOCK, REPLACE THE FUEL TANK, AND I HAD SOME TRANSMISSION WORK DONE. MY BIGGEST PROBLEM IS HAVING TO REPLACE THE LOW BEAM LI…
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I PURCHASE MY 2003 MERCEDES FROM CARMAX IN 2 YEARS AGO. IT HAD 45,000 MILES WHEN I PURCHASED IT. FROM THE TIME I PURCHASE THIS CAR I HAD TO REPLACE THE SUNROOF MOTOR, REPLACE THE SHOCKS, REPLACE THE TRUCK LOCK, REPLACE THE FUEL TANK, AND I HAD SOME TRANSMISSION WORK DONE. MY BIGGEST PROBLEM IS HAVING TO REPLACE THE LOW BEAM LIGHTS EVERY 6 MONTHS. I SUSPECT THERE IS AN ELECTRICAL PROBLEM, BUT CANNOT COMPLETELY PROVE IT WITH THE MANUFACTURER. WITH 1 YEAR, I HAD TO REPLACE THE BULBS 3 TIMES. I HAD TO REPLACE THE FRONT LOW BEAM BULBS AND THE BRAKE LIGHTS. THIS IS SURPRISING SINCE THIS CAR (UNDER MY OWNERSHIP) HAS NEVER BEEN IN AN ACCIDENT. I AM SO DISAPPOINTED I PURCHASED THIS CAR! *TR
Official recalls
324V874000 · Visibility:sun/moon Roof Assembly
Nov 19, 2024
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2001-2011 C-Class, CLK, E-Class, and CLS vehicles. Please see the recall report for a complete list of models and model years. The glass sunroof panel may not be properly secured and can detach.
Consequence & remedy
Consequence: A detached sunroof panel can become a road hazard, increasing the risk of a crash.
Remedy: Dealers will inspect and replace the sunroof panel as necessary, free of charge. Owner notification letters were mailed January 10, 2025. Owners may contact MBUSA customer service at 1-800-367-6372. This recall is an expansion of previous NHTSA recall number 22V-954. MBUSA's number for this recall is 2024120001/2/3.
22V954000 · Visibility:sun/moon Roof Assembly
Dec 23, 2022
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2001-2011 C-Class, CLK, E-Class, and CLS vehicles. Please refer to MBUSA's recall report for specific vehicle model details. The glass sunroof panel may not be properly secured and may detach.
Consequence & remedy
Consequence: A detached sunroof panel may become a road hazard, increasing the risk of a crash.
Remedy: Dealers will inspect and replace the sunroof panel as necessary free of charge. Owner notification letters were mailed February 3, 2023. Owners may contact MBUSA customer service at 1-800-367-6372. This recall expands NHTSA recall number 19V-918. MBUSA's numbers for this recall are 2023010004, 2023010005, and 2023010006.
19V918000 · Visibility:sun/moon Roof Assembly
Dec 20, 2019
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2001-2011 vehicles. The bonding between the glass panel and the sliding roof frame may deteriorate, possibly resulting in the glass panel detaching from the vehicle. For a full list of the affected models visit: https://static.nhtsa.gov/odi/rcl/2019/RMISC-19V918-4126.pdf
Consequence & remedy
Consequence: A detached glass panel can separate from the vehicle and become a road hazard, increasing the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will inspect the glass panel bonding and replace the sliding roof, as necessary, free of charge. The recall began July 10, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020040011.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
0No exact-year investigations in this snapshot.