definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
36,500 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

1997 BMW 740 cooling system problems

cooling system problem

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1997 BMW 740 Owner Comments

problem #4

Aug 252003

740 8-cyl

  • Automatic transmission
  • 75,000 miles


There's a major flaw design in the BMW 740I and 740il fgrom years 1995-200. I was just driving and it failed without hesitation. I spoke with a lot of other owners of this model and they had the same peoblem. To some people it happend as they were driving on the highway spilling coolant all over their windshield and losing control of their vehicle.

- Ann Arbor, MI, USA

problem #3

May 292003


  • miles
Upper nipple with hose connector on radiator is made of plastic and breaks off with fragments left in the hose. This really should not be made of plastic as intensely hot water passes through it all the time. This amounts to an expensive repair.

- Three Bridges, NJ, USA

problem #2

May 142003

740 8-cyl

  • Automatic transmission
  • 71,000 miles
I have had three separate failures of plastic radiator components in my 1997 BMW 740il in the space of 5 months. At first inspection, these appear to me to be thermal fatigue failures indicating some manufacturing defect in the plastic. BMW denies any such issue and refused to replace the failed components under warranty. The first instance was a minor leak that developed from a small pipe that exits the top of the radiator. Before I had that repaired, the neck of the top inlet to the radiator broke off while I was driving. The radiator had to be replaced. A little over a month later, I saw steam emerging from the radiator and noted a 1/4" split in the center of the intergral fluid reservoir where water was spraying out. This component had not been replaced when the radiator was replaced. As this was not in a typical stress area like a corner, seam or bottom, I believe this was caused by fatigue. The fact that all of these failures occurred on plastic components so close together in their life implies a common failure mechanism to me. The dealer commented that "they see a lot of these kinds of failures." As the vehicle has only 70,000 miles on it, this would seem unusual unless there were some underlying flaw in BMW's design or manufacturing of the cooling system.

- Loomis, CA, USA

problem #1

Feb 212000


  • Automatic transmission
  • miles
While traveling at highway speed of 75 mph radiator upper neck to which water hose connects broke from the weld. Dealer notified.

- Clinton, MD, USA

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