Mercedes a160 1.6 petrol, non air con model.
noisey drive belt/pulley noise at idle, gets worse with increased revs.
suspect bearing on alternator, belt tensioner or idler pulley.
dont think it's the water pump, not a typical noise of a water pump, its more of a whining noise than a screeching noise that you would get from a water pump.
these cars are on a timing chain so the noise rules that out!
are you aware of what it is most likely to be? i've been told that these cars are a right pain to work on!!! can i change the parts without dropping the engine?
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Yes everyvthing will stop working power steering the water pump will not work hence the over heating yhe battery will not charge air con wont wirk compressor wont work there cheap enough andceasy enough to replace about £18 for belt any garage should only charge for 20 minuets work its that quick to do if you can get the diagram on which way it goes ( google images ) then you can try it yoyr self its easy to do
You need to check the belt that drives the alternator for proper operation. The belt may be old and worn, or a pulley may be not freewheeling, but seized or with a bad bearing. Possibly the tension on the belt is too loose from a worn out tensioner.
First, spray a little water on the belt with engine running and see if noise goes away, possibly a worn belt. Pull the belt off and check all pulleys. Spin them by hand and see if spins easy, no rough feeling or a catch when spun. Check alternator pulley, idler pulley, tensioner pulley, PS pump pulley and A/C compressor pulley-check them all for free wheeling. If good check the tension on the belt when installed. If unsure, have a mechanic check tension with a belt tension tool. If belt is good and pulleys good, check alternator output with a voltmeter on the battery with engine running. If voltmeter is below 13.5 volts, the charging system is still not working properly. Have it checked out.
Have you tried running the engine for a minute with the belt removed? If the noise is still present when you do this, then it is not related to the belt or any of the pullies. I have seen "whining" noises coming from the air induction system - namely, vibrations set up by the idle air control and reverberating in the intake. This will not go away with the belt removed.
If the noise does go away with the belt removed, then the problem HAS to be one of the pullies or components that are driven by the belt. Power steering pump a little low on fluid maybe? Or possibly a rough bearing in an idler pulley? Spin each pulley by hand and see if it makes any noise. You should not be able to "hear" them spin. If you get any kind of rattle or roughness when spinning the pulley by hand, then this is most likely your problem-child.
common cause is the belt gets worn and stretched, yes the tensioner is suppose to keep its tension but also the tensioner gets weak and all it takes is a couple slips of the belt to harden and you will get a squeal. Spray WD 40 on tensioner, idler pulleys, alternator behind pulley, not on belt or where belt rides on pulleys but at all bearing locations. Did squeal stop? If not replace belt. Usually a chevy water pump will leak, or grind not sqeak unless there is rusty non lubricated so called coolant in it which 1974 maybe but 2007 na im sure you didn't neglect this baby. You can also inspect the belt carefully, possibly buy a can of belt dressing and spray belt but do make sure you use a ratchet and check your belt tensioner for smooth non sticky tension pressure.
Loosen the belts [ you do not need to remove] so they are free of tension to all pulleys.Start engine , if noise goes away either belts were too loose [ common on lx 450] or you have a worn & noisey pulley /bearing.have seen idler pulley below alternator have dry / noisey bearing.Otherwise if idler is ok it has to be another belt driven assessory , ac clutch,water pump & or fan clutch.Good Luck.