[W126 Coupe] Squealing N3 module

[Dick Spellman]

Hi Rick:

I am stopping at an MB dealership late tomorrow to pick up an air guide 
housing (the big rubber lower half of the air volume meter) for my 86 
300SE.  I can usually bring an extra cup of coffee along and ask to see 
the senior tech that is expert on 107, 123, 124, 126 etc. and see if he 
has ever opened up an ECU.  I'd be curious if there was in fact a small 
fan in there.  Just looked at a spare I have and it's got some sort of 
vent or inlet on it.

Dick

Richard Hesek wrote:

>  Hi,

>  It may be due to the cold weather (small single digits) that went thru

> here last week but my ECU (N3 CISe engine control unit) started squealing

> upon start up. It would quiet down after the passenger compartment warmed

> up and since Friday the temps have risen to the 40 degree mark.

>   I am reasonably sure it is the N3 module but there is also an "aspirator

> blower" in the same location (passenger footwell side kickpanel) which

> could be the culprit. The squealing sounds like motor bearings.

>   There was no change in my near perfect running engine also.

>

> Any ideas or experiances here?

>

> Rick Hesek

> 87 560 SEC

> Northboro, MA

>

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