Two problems related to radiator hose have been reported for the 2005 Mini Cooper S. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Mini Cooper S based on all problems reported for the 2005 Cooper S.
Earlier in the day I took the car on a day trip to lake tahoe driving a combination of interstate and mountain pass road. 3 hours later, my wife had taken the car to run an errand and came home and parked the car in the garage completely off and locked. 10-15 minutes later we hear the car alarm going off. We opened the door to the garage and saw white smoke coming from the engine compartment. There was high pitched wining also. When I opened up the door the put in neutral, the lights on the instrument panels were all on with no keys in the ignition. Opened the garage and moved the car to the driveway and away from the house. Called the fire department and I used an extinguisher underneath where orange glow was visible. The glow of the flames were toward the back part of the engine compartment and low. Saw no visible flames in the main compartment when the hood was popped open when fire department showed up they used a garden hose to cool engine compartment and suggested to disconnect the battery which I did. I had the car towed to the Mini dealer in reno, nv. Updated 8/8/12 the consumer stated the parts that seemed to have caused and were damaged in the incident were the power steering pump, power steering cooling fan, and electrical harness all in the engine compartment of a 2005 Mini Cooper S. Updated 08/14/2012.
Vehicle fire 5/2/2012. Car parked for 4 hrs. Returned to car & drove it <50 yards for ~2 minutes (moved it from street to parking lot). Turned it off and went in store. Returned ~4 minutes later, noticed smoke/exhaust smell; presumed it was adjacent car. Unlocked car. Car would't start (no lights/electrical at all). I then noticed white smoke coming from hood. Opened hood then noticed flame/fire inside engine compartment. Went in store, got fire extinguisher and put fire out. Invoice was >$3500 from Mini dealer. The dealer's assessment: "verified power steering pump has overheated to the point where it has burned up internally as well as externally (melting all three connectors and the wiring leading to them). Inspected power steering cooling fan and verified cooling fan is seizing up which very likely led to the overheating and eventual failure of the power steering pump. Removed engine compartment fuse box to examine megafuse powering the power steering pump, fuse is intact and did not burn up. Inspected power steering pressure hose and it appears the rubber section of the power steering pressure line was subjected to the heat/melting of the main power connector (it's in very close proximity to the connector) and it appears the hose has taken a level of damage from the heat. Recommend replacement of power steering pump, the wiring section/connector pigtail from the fuse box (this is the main power connector), the engine wiring harness (contains two other electrical connectors to the pump which received extensive damage), the power steering fan (likely cause of failure), power steering pressure line (high pressure hydraulic line which has been exposed to the main connector melting and subsequent heat), and other miscellaneous items associated with those components (o-rings, crush rings, hose clamps ect. . . )".