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i would check your tensioner and idler pulley. you may have a bad bearing and its dragging the belt causing friction which then creates the burning belt smell. remove your serpentine belt and spin all pulleys by hand p/s, alternator, water pump, tensioner, idler, a/c. if the pulley is stiff or feels rough then thats the component at fault and you would need to replace that certain component and its also best practice to replace your belt now too.
did you remove the air compressor ,and if you did you need to put something in its place for the belt tensioner will not hold tension . it will be easier to just replace the air condition pump or best known as the air compressor with a used one . this is my link to my garagehttps://www.facebook.com/TedsRepairs
Only you could tell for sure, but try this-remove the belt and turn the compressor pulley by hand-is it real tight, lots of drag? there should be virtually no drag, if there is that is your problem-while it is off, check the other pulleys as well, all should turn easily except for the crank pulley, of course-check the water pump, alternator, power steering and if it has an air pump, check it too.
Possibly, but water pumps on these cars generally leak for a long time before they get bad enough to make noise.
The more likely culprit is the pulley bearing on one of the tensioners or the idler on the serpentine belt. On the e46, BMW decided not to sell some of the pulleys as separate parts, They sell only the complete tensioner assembly.
If you do your own work, I suggest the following:
1) You will want to put on fresh serpentine belts while you are working on it, so go ahead and get some before you start. On-line will be a bit cheaper than the parts store and way cheaper than the dealer. Original belts were manufactured by Continental. You say the noise sounds like it is coming from the top and the idler pulley is the highest one, so I would buy the idler pulley at the same time, it might save you time and a trip later.
2) Put the front of the car up on ramps and remove the splash shield from beneath the engine. You probably want to remove the air filter box as well to give you another pathway where you can get your hands in there to work.
3) Make careful note of the belt routes. Perhaps take a picture.. It is physically possible to put the top one one wrong such that it spins the alternator backwards.
4) With Channel Lock pliers, pull back the tensioners so you can slip the serpentine belts off the pulleys.
5) Now you can spin all of the pulleys, including the water pump, to see which one(s) are noisy. If you are lucky, you will already have the only new pulley you need (but life is not like that).
If the pulley you need is not sold separately, you MIGHT be able to save $50 or so if you can find a parts person who is willing to compare your pulley to other pulleys in the parts bins to find a match. Fresh baked cookies are useful bribes for parts people. The pulley need not be an exact match so long as it fully supports the belt and does not touch any other part.
for example, if you have a 3.8l as shown here... it will be a trial and error process some part stores will list this vehicle w/o a/c even though they all came with a/c
if you cannot find a part store with a listing on this vehicle w/o a/c then you will actually have to measure the path around all pullies except a/c and then expect to try 3+ different belts until you get the one that fits best
An easier option is to order a a/c dummy pulley but you will have to remove the compressor
The symptoms you have described sounds most like you had a serpentine belt break or fall off the pulley system (rare but possible).That is a fairly simple job to replace the serpentine belt,whether you replace it yourself or have a professional do the job it isn't a costly repair, providing that is the only problem.There is a serpentine belt routing label under the hood, usually on the plastic piece that goes across the front of the engine compartment near the hood latch release.There is a spring loaded belt tensioner that holds tension on the serpentine belt(labeled on the routing label) rotate the tensioner against the spring pressure, rout the belt according to the routing label, then slowly release tensioner against the new belt and that should complete the installation.Hopefully that is the solution. Good luck !
No. There is a tensioner pulley which controls the tightness of a serpentine belt. In addition, the belt travels a specific path. Bypassing the air conditioning compressor not only requires a different size belt, it would require rerouting the belt and omitting one component would mess up the travel of the belt and may actually result in reversing the rotation of some of the components that the belt turns. In addition, the belt tensioner is designed specifically for that length and size of belt. You would most likely affect the belt tension, which would result in slippage or overtightness. Overtightness on the bearings of the devices the belt controls will cause that unit to sieze.