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Old 11-23-2003, 03:07 PM
edge's Avatar
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Join Date: May 2001
Location: CT
Posts: 1,382
High pitch squel from cold start on 94 E320

In the mornings when my 94 E320 is first started, there is a high pitch squel under the hood. After a couple of minutes, the squel goes away. Does anyone have an idea of what I have to look out for? Thanks.
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Old 11-23-2003, 03:12 PM
sixto's Avatar
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Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
Loose or wet serpentine belt?

95 S420
91 300SE
87 300SDL
83 300SD
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Old 11-23-2003, 04:27 PM
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Join Date: Dec 2002
Location: Fairfax, VA
Posts: 520
possibly the air pump.
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Old 11-24-2003, 10:33 AM
glenmore's Avatar
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Join Date: Sep 2002
Location: Los Angeles
Posts: 963
I had a piercing loud squeal that would stop after a few seconds. It was coolant from a leaking water pump splashing on the belt whenever I came to a stop.

1991 300CE
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Old 11-24-2003, 10:37 AM
chazola's Avatar
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Join Date: Nov 2003
Location: Dorset, United Kingdom
Posts: 1,222
The belt tensioner may need adjusting or replacing. Mine had the exact same symptoms.
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1967 250SE W108 M129
1972 280se 3.5 W108 M116
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