Engine Overheating Alternator Power Steering Issues
 

I just had the alternator replaced last month on my 2001 4.4i X5. Yesterday while I was driving on the freeway and after accelerating quite rapidly to merge with traffic, I noticed a burning smell. A few moments later the alternator light and coolant temperature warning light came on. While pulling over to let the engine cool down I noticed that I had no power steering. Also the heat is not working at the proper temperature. Nonetheless, the engine cooled down quickly. I was able to drive for another 10 minutes until the engine overheated again. Luckily with frequent stops I was able to get home without blowing up the engine!

The next day I checked the coolant levels; reservoir filled. Oil filled, etc. Although the alternator light was on, the car started just fine in the morning.

I am curious to know if anyone has had a similar issue with their X5? And, if so what was the problem?

Very odd set of challenges. When you start the car does it make any noise? Your belt tensioner could be bad allowing the belt to slip therefore causing the burning smell (rubber). Or the shop put the wrong size belt on it when they replaced the alt. This could also make it slip instead of running the water pump and power steering. A loose belt would explain all of that. One belt drives everything under the hood, with exception to the a/c compressor. When rubber gets hot it gets greasy and melts a bit, so if its loose, there you go...

Keep us posted.

Mystery solved (well maybe). The shop that replaced my alternator DID NOT replace the belt. They could not give me a valid explanation as to why the belt was not replaced. Anyway, I am making an appointment with another shop to replace the belt. Cross your fingers.

Great, they will know immediately if the tensioner is bad. I always keep a spare belt in with the spare tire, you never know when you will need one and who will have it on the shelf.

If it is the tensioner:
X5 Cooling System Parts

Belt:
X5 Cooling System Parts


BTW, the water cooled Alt sells for $399, the other $390. Keep them honest.