Tim McNamara

I recently noticed that my 1990 240 makes a sort of sighing sound when I
turn the car off. It seems to be coming from the dashboard and I wonder
if it is not some part of the vacuum system controlling the vents. Is
this normal or indicative of a problem?

James Sweet

Tim McNamara wrote:
> I recently noticed that my 1990 240 makes a sort of sighing sound when I
> turn the car off. It seems to be coming from the dashboard and I wonder
> if it is not some part of the vacuum system controlling the vents. Is
> this normal or indicative of a problem?


Probably a vacuum leak is letting the vent solenoids relax, it's not the
end of the world, but it will probably get worse over time.

Tim McNamara

In article <lES6f.4914$tl5.1328@trnddc02>,
James Sweet <jamessweet@hotmail.com> wrote:

> Tim McNamara wrote:
> > I recently noticed that my 1990 240 makes a sort of sighing sound
> > when I turn the car off. It seems to be coming from the dashboard
> > and I wonder if it is not some part of the vacuum system
> > controlling the vents. Is this normal or indicative of a problem?
>
> Probably a vacuum leak is letting the vent solenoids relax, it's not
> the end of the world, but it will probably get worse over time.

That makes sense. Thanks!

User

In article <timmcn-E2F9A4.23384522102005@news.iphouse.com>,
timmcn@bitstream.net says...
> I recently noticed that my 1990 240 makes a sort of sighing sound when I
> turn the car off. It seems to be coming from the dashboard and I wonder
> if it is not some part of the vacuum system controlling the vents. Is
> this normal or indicative of a problem?
>
There a vacuum hose from the manifold to the firewall that supplies
vacuum to the reservoir that sits on the floor under the center console
to power the push button vent switches. The nipple at the manifold is
too big for the hose, so there is a reducer that uses a small piece of
pipe to make a 90 degree fitting. The vacuum hose that fits over the
pipe splits and drops vacuum to the reservoir. When the motor is shut
off, you hear the air rushing in to fill the vacuum in the reservoir.

Bob
--
The goal when driving is to miss the maximum number of objects.

Tim McNamara

In article <MPG.1dc8e5ec5677c6d19896ce@news.verizon.net>,
User <radietzno@spamioip.com> wrote:

> In article <timmcn-E2F9A4.23384522102005@news.iphouse.com>,
> timmcn@bitstream.net says...
> > I recently noticed that my 1990 240 makes a sort of sighing sound when I
> > turn the car off. It seems to be coming from the dashboard and I wonder
> > if it is not some part of the vacuum system controlling the vents. Is
> > this normal or indicative of a problem?
> >
> There a vacuum hose from the manifold to the firewall that supplies
> vacuum to the reservoir that sits on the floor under the center console
> to power the push button vent switches. The nipple at the manifold is
> too big for the hose, so there is a reducer that uses a small piece of
> pipe to make a 90 degree fitting. The vacuum hose that fits over the
> pipe splits and drops vacuum to the reservoir. When the motor is shut
> off, you hear the air rushing in to fill the vacuum in the reservoir.

Very helpful, thanks. I'll try to track down the leaky vacuum hose
under the hood once it stops being cold and rainy.