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Registered
2003 STS best car EVER
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56 Posts
Discussion Starter #1
I don't know if it has been raised as an issue before. I looked and didn't find it an archived related problem though the guy that had a heat problem might have been close. I never noticed a lack of heat in the car but the car could have been compensating from the passenger side or I was in layered clothing.

The noise was a higher pitched 'whir' left of the steering wheel and had a "belt" quality about it that seemed to be coming from the air vent. It would start immediately when I turned the engine over in cold weather and last for two or so minutes then stop once it was warmed up. It never happened on a sunny warm morning.

Well, I finally had my mechanic look at it after a few months when this started.
His diagnosis was a failed "Inside Air Temperature Sensor". The part was $98 and installed within an hour.
I'm hoping he was right... he has been in the past. Time will tell.

Just sharing.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,307 Posts
The mechanic was correct. The bushing dries out and starts to squeal. Sometimes you can lube it and save it.
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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67,166 Posts
Posted in these forums many times - Google "cadillac forums seville cabin air temperature aspirator" or something close.

How-to's on muffin fan (computer board cooling fan, 12V) lubrication down in Cadillac Tech Tips - with pictures. The module is about $35 at a Cadillac dealer, a half hour cleanout and install IF the fan is frozen.
 

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Registered
2003 STS w/BoseNav, 1993 Deville, 1985 Deville
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1,089 Posts
I just 'refurbished' my Aspirator Fan (as GM calls it). It's been discussed on this forum quite a bit as Submariner says. Easy to replace/fix. I just took mine out, lubed the bearing with 10w-30 motor oil and reinstalled it.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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18,909 Posts
yep - we get a bunch of these questions -
it usually happens after the first really cold snap -
then continues sporadically throughout the winter -

a drop of oil cures 90% of them -
 

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Registered
2003 STS best car EVER
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56 Posts
Discussion Starter #6
I am keeping the mechanic. His staff called me after they serviced and and asked if I was happy with the work.
"More than happy I told them".

I didn't know I had bad air flow till I got some.
Defogging just became easier.

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Cold snap?
What constitutes a cold snap to you?
I live in Winnipeg. My STS lives in Winnipeg. The car has to have heart to survive.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
18,909 Posts
I am keeping the mechanic. His staff called me after they serviced and and asked if I was happy with the work.
"More than happy I told them".

I didn't know I had bad air flow till I got some.
Defogging just became easier.

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Cold snap?
What constitutes a cold snap to you?
I live in Winnipeg. My STS lives in Winnipeg. The car has to have heart to survive.
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Cold snap?
What constitutes a cold snap to you?

the little fan inside the aspirator
USUALLY squeals when the outside temp hits around ZERO for the first time -

then MOST of the DIY people who come here for a diagnosis
put a drop of oil on the fan bearing - and it's good for another 10 years -

the "electronics" part of the aspirator RARELY - if ever - fail -
the problem is the little fan that draws cabin air past the thermistor -

when this little fan gets covered with dust - or the bearing dries up -
the climate control system does not get an accurate cabin temperature reading -
so the system can't accurately adjust the temp -
 
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