1998 BMW 540I Engine cooling Problems
- Complaints
- 16about this part
- Share
- 62%of 26 total for the year
- Median mileage
- 57,262miles
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA recorded 16 complaints about the engine cooling of the 1998 BMW 540I, 62% of the 26 complaints for this model year. Where a mileage was given, the median is 57,262 miles.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I was driving down a busy street one evening and as I came to a light, smoke started coming out of my hood. Fortunately it was in the evening and traffic was lighter than usual. I pulled into a parking lot off the side of the road. Having known others that this has happened to, I first checked the radiator and sure enough, there was a large crack down the side of the housing. I had the car towed home and purchased a new radiator from Bmw of seattle the following morning. …”
NHTSA complaint #10079183, filed 2004-07, 49,000 miles“White steam was coming from under the hood onto the front windshield. The steam was fogging the windshield, and causing poor visibility while driving 50-55 MPH. Consumer was able to get the vehicle to a repair shop. Dealer informed the consumer that the upper neck connector of the radiator hose broke.”
NHTSA complaint #10109039, filed 2005-01, 86,000 miles“Engine cooling radiator hose fitting broke off. Lost all coolant on highway. Dealer replaced radiator under warranty and stated it is common failure on 540I Bmw due to plastic parts not stong enough to resist temperature. Well documented on private web sites.”
NHTSA complaint #10039559, filed 2003-09, 50,339 miles“Plastic neck of radiator on my '98 Bmw 540ia broke completely and suddenly on highway. White smoke came out under the hood. Saw temp gauge climb up rapidly. Pulled over immediately. Towed to dealership for repair. No one was hurt luckily.”
NHTSA complaint #10062384, filed 2004-03, 61,000 miles“2nd catastrophic radiator failure. Not a leak, the neck breaks off causing immediate loss of cooling. 1st radiator at 45k, 2nd at 92k. Based on other's experiences, this is very common for this model (and even longer life than many). Causes loss of vision due to amount of steam released. Less experienced driver may have difficulty controlling vehicle to get to side of road quickly to shut down. No way to predict the failure. Same issue with expansion tank. Both failures are on plastic parts.”
NHTSA complaint #10105896, filed 2005-01, 92,801 milesRelated service bulletins
- 10142928Dec 1, 2017SERVICE ACTION: PROGRAM DME (FOR O2 SENSORS): Due to DME software error, the following oxygen sensors plausibility fault codes may be stored in DME 5.2.1 control module:
Engine cooling: other model years
Other parts of the 1998 BMW 540I
2 complaintsBody and structure
2 complaintsAir bags
1 complaintsBrakes
1 complaintsSteering
1 complaintsSuspension
1 complaintsTransmission and drivetrain
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 1998 BMW 540I
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 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