One problem related to engine overheat has been reported for the 2008 BMW 535. The most recently reported issues are listed below.
While driving, the entire electrical panel [speedometer, radio, display screen, etc. ] begin to click on/off each time reappearing with appeared to be everything but english. Soon to follow, I received a warning light indicating "engine overheated", "engine power was being reduced", and "to stop the vehicle" when possible. Unfortunately, I was in the middle of traffic and could not immediately pull off to the shoulder. The vehicle didn't travel very far before complete engine power was lost due to the possibility of "fire risk" as indicated on the panel.