1999 Mercedes-Benz M Class Engine cooling Problems
- Complaints
- 4about this part
- Share
- 22%of 18 total for the year
- Median mileage
- 84,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the engine cooling of the 1999 Mercedes-Benz M Class, 22% of the 18 complaints for this model year. Where a mileage was given, the median is 84,000 miles.
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.
“My 1999 ml 320's engine recently (27 and 29 sept 05) instantaneously stalled without warning while driving-no check engine light, just died in the middle of the road!. Good wx, no rain, dry, daytime. It restarted after 5 mins. Traffic went around me. Ml is well maintained,vehicle has 117k miles. Mechanic could not duplicate (no codes). Fuel pump checked ok. At my request, the mech changed out the crankshaft position sensor (cps) on 30 sept. Cost to repair $251.96. Ml320 has run fine so far (7oct). I feel that this sudden engine failure (cps) while driving is a significant safety issue. …”
NHTSA complaint #10139067, filed 2005-10, 117,574 miles“I have problems with my check engine light from and faulty oxygen sensor, the car was repaired under warranty. Then I had a hose disconnect and lost power steering prior to the recall on the hose cloamp and I paid the towing and repairs myself. Now I have had a major mechanical problem and on august 5th, my car lost power steering, air conditioning, the battery light came on and then my car began overheating. Apparently the crankshaft broke and it shredded one of the major belts, which damaged the oil pan and water pump. I immediately pulled over and had the car towed 20 miles to the dealer. …”
NHTSA complaint #10069784, filed 2004-01, 45,000 miles“Transmission failed, repaired four times, electrical system, battery failed, replaced, oz sensor failed replace 3 times, fuel system pump and sensor replaced, front passenger restraint system failed”
NHTSA complaint #9001677, filed 2000-07Engine cooling: other model years
Other parts of the 1999 Mercedes-Benz M Class
6 complaintsElectrical system
3 complaintsSeat belts
3 complaintsTransmission and drivetrain
3 complaintsFuel system
2 complaintsBrakes
1 complaintsElectronic stability control
1 complaintsEquipment
1 complaintsTires
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 1999 Mercedes-Benz M Class
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