NHTSA — Engine And Engine Cooling: Cooling System Problems


definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
40,000 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.

1998 BMW 740 cooling system problems

cooling system problem

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1998 BMW 740 Owner Comments

problem #2

Apr 042005

740 8-cyl

  • Automatic transmission
  • 80,000 miles


Low coolant message came on while driving. Within a few miles, radiator cap overpresured and steam burst out while on the highway. Pulled over and was towed to the dealer. Replaced coolant hoses. 4 months later, low coolant message came on again while traveling; stopped at a service station to check level; level was very low, and a slow leak was visible. Replaced coolant reservoir assembly. 6 mos later, check engine light came on. Dealer replaced sensor. One week later, the low coolant message came on again (3rd time). Coolant was low; took to dealer for repair. All work was at owner's expense (non-warranty).

- Portland, OR, USA

problem #1

Mar 302002


  • miles
While driving on a higway and taking a turn over a curved portion of the highway I found the power in the steering was not functioning and the steering wheel became extremely hard. Whe I tried to brake and pull to the side the brake was also quite hard. The car had then to be towed to a BMW dealershi, and the problem was detected and fixed. I was informed that the water pump had failed which resulted in the belts to break, causing a loss of power in the steering and the brakes. This was quite a disturbing experience whiel driving this car on a higway and could have caused a major accident. The BMW 740 il is quite a heavy car and without power in the steering and the brakes it is very difficult to control the car at highway speeds. The power system failing due to water pump failure appears to be of serious concern in a vehicle that is advertised as one of the marvels of engineering. The car is still under warranty.

- Fairfield, CT, USA

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