[W126 Coupe] Heater noise

[Markus Meyer]

Camran,

How do you turn the heating system off?  Might sound like a silly question,
but, there is a way to press the buttons such that all are in or all are
out.  The only way I found to truly shut it off is to have the first 4
buttons (from left to right) "out", and the last button "in".

There are two motors actually - a blower motor under the glovebox that
circulates the air through the various ducts in the car.  Then, there is
another aspirator motor that sits to the right of the glovebox which pulls
air to the overhead interior temp sensor to tell the system whether it needs
to heat or cool at that moment.

Markus

   On Jan 6, 2010, at 12:30 PM, Camran Nassiri wrote:

>

> Ever since the cold weather has hit our area (below 32 degrees) when I

> start the car from a cold start a screeching noise, like fan turning, comes

> from under the dash in the passenger compartment.  As soon as the car heats

> up a little (after 5 minutes or so) then the noise stops.  The noise is

> there even if I turn the heating/cooling sustem off.  Any ideas?

>

> Thanks,

> Camran

> 90 560SEC, 91 420SEL, 80 240D

>

>

>

>

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