there is a small motor that sucks air in over a sensor to control interior
temperature - the bearings get dry after 20 years - motor is located above
glove box near center of car - it's connected to the tube that goes to the
small round grill - you should probably remove it, oil bearings and put it
back as a precaution, but that may well be where the buzz is coming from.
Heater fan is in the engine compartment on other side of firewall
as an aside, I have a spare heater fan motor that is good, if you need it,
and I have a spare one of these little motors too
"bryan" <bryanle****e@[EMAIL PROTECTED]
> wrote in message
news:a2d42d06-0d7f-4e2c-a60e-b2a6fe46f4c2@[EMAIL PROTECTED]
> '87 944 n.a. -- need help identifying origin of electrical noise.
>
> symptom : there's an electrical-ish sounding hum / buzz apparently
> behind the dash on the passenger side that is constant while the
> electrical system is engaged (i.e. when the key is at stage I) and
> persists after the engine is operating. it varies little if at all.
> once i started hearing it, i have failed to hear it "disappear".
>
> observations : seems not to be localized at cigarette lighter, but
> its close. the ventilation system seems OK i.e. temperature/fan/
> defrost works. glove box light connection is "dirty", but sound is
> not there. clock is backlit but not working. not sure what to say
> about A.C. haz. lights work. i looked thru ****sche's parts catalog
> for 1987-1991 944's, esp. sec. 9.901. i am stuck. any questions/
> pointers appreciated.
>
> btw, ****sche has another catalog for 944's, but for 1985-1988 -- is
> the overlap redunant?
>
> -bryan
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