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Old 05-09-2005, 09:01 PM
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190E squealing

My 190E has a nasty squeal whenever the car is running. I originally thought it was the belt tensioner pulley as it had bad bearings but surprisingly it did not fix the noise. I am almost certain the noise is concentrated right above the water pump. The water pump was replaced on it almost a year ago, however the MB brand coolant was not used to refill the system. Could not having used the proper coolant caused the water pump to make noise? Other than the noise, the engine runs at normal operating temperature.
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1992 190E 2.3
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Old 05-09-2005, 09:06 PM
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Could not having used the proper coolant caused the water pump to make noise?
no

If I remember correctly you have an idler pulley up there somewhere. Check it to see if it has gone bad.
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Old 05-09-2005, 09:15 PM
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I already replaced that
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Old 05-09-2005, 09:57 PM
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Quote:
Originally Posted by gp87210
I already replaced that
Does the noise go away when you remove the oil filler cap ?
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Old 05-09-2005, 10:15 PM
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What is the purpose of that?

But ill still try it and see
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Old 05-09-2005, 11:14 PM
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Originally Posted by gp87210
What is the purpose of that?

But ill still try it and see
Some times, the engine builds up vacumm and causes air to be drawn in past the crank seals which can make a loud noise like screeching metal.

Mostly happens to BMW's and Asian engines with PCV's.
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