2003 Mercedes-Benz SL500 Engine cooling Problems
- Complaints
- 4about this part
- Share
- 5%of 80 total for the year
- Median mileage
- 72,810miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the engine cooling of the 2003 Mercedes-Benz SL500, 5% of the 80 complaints for this model year. Where a mileage was given, the median is 72,810 miles. 1 a fire, according to the filers.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Driving along on 2/14/2015, I hear a banging coming from the back of the car. I notice it only does it when I am excelling or braking. I thought there may be something in the trunk, like a liquid with something floating in it, banging up against the side of the container. After I parked, I checked out the box that I have put in the back of my car. There was nothing there that would make this noise. Upon further investigation, I see that there many complaints against the baffle that is inside the gas tank that comes lose and bangs the sides of the gas tank. This is not acceptable. …”
NHTSA complaint #10683565, filed 2015-02, 114,121 miles“I was driving on the freeway when the idler pulley simply fell off the front of the engine. Obviously, the belt came off too. The vehicle was hard to control since the power steering stopped working. Additionally, breaking effort increased, stability control malfunctioned, and a few other non-essential systems became inoperable.”
NHTSA complaint #10453121, filed 2012-03, 90,000 miles“Vehicle has been driven less than 52,000 miles and both driver and passenger side catalytic converters have required replacement approximately 2 months apart. Retractable hood has now failed. Concerned that faulty design in catalytic converters will causerepeat failures in future. Concerned that retractable hood failure is sign of additional design flaws with this vehicle.”
NHTSA complaint #10195548, filed 2007-07, 51,200 miles“The contact owns a 2003 Mercedes-Benz SL500. While driving into the garage, the abc pump warning indicator illuminated and the contact noticed smoke inside the vehicle. In addition, the contact noticed a large amount of hydraulic fluid on the garage floor. The vehicle was towed to a dealer where it was diagnosed that the front and rear axle valve lock, and pressure reservoir for the abc system needed to be repaired and flushed. The vehicle was not repaired. The VIN was not included in NHTSA campaign number: 07v263000 (suspension, engine and engine cooling). …”
NHTSA complaint #10936250, filed 2016-12, 55,620 milesRelated service bulletins
- 10033070Dec 16, 2009Xentry (mercedes): engine warning lamp is currently on or was on and a delay fault of the camshaft adjust to current or stored in the engine control unit. Models 171, 203, 209…
Engine cooling: other model years
Other parts of the 2003 Mercedes-Benz SL500
34 complaintsFuel system
20 complaintsBrakes
14 complaintsElectrical system
10 complaintsSteering
6 complaintsElectronic stability control
5 complaintsAir bags
4 complaintsTransmission and drivetrain
4 complaintsBody and structure
3 complaintsEngine
2 complaintsEquipment
1 complaintsSeat belts
1 complaints
← All problems reported for the 2003 Mercedes-Benz SL500
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology