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Old 03-21-2005, 17:01   #1 (permalink)
IceWizard
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1989 Tempo GLS - Panel Vents/Vacuum Lines/HVAC Switch

I have a 1989 tempo that suddenly decided to no longer allow air to
come out of the panel vents. I did some troubleshooting, looked up as
much info I could online and in Chilton's, and I'm currently almost to
the point of completely taking the dash off. I'm hoping someone else
with experience can help stop me from spending a whole day attempting
that.

Basically, air will only come out of the Defrost and Floor.

-- If I choose AC/MAX AC/Panel Vents air will come out of the Window
Defrost vent.

-- If I choose Defrost it will come out of the Window Deforst Vent.
-- If I choose Floor it will come out of the Floor vents.

This happens for both heat and cold.

I have come to the conclusion that it is either a vacuum problem or
somehow related to the vacuum lines.

Behind my glove compartment are 2 vacuum lines, one black and one
white. They are both fastened tightly and do not appear to be
leaking. I have not disconnected one yet as I am unsure of if that
will cause any other problems. Is it safe to remove one of them from
the connector while the car is running?

If there are only two lines, would the Window/Floor switching seem to
indicate that these lines are fine, or could one of them be the
culprit?

Also, has anyone ever pulled out the heating/ac control unit from the
panel? I have the tools to remove my radio, and the unit has the same
holes. I can pry it out a little with those tools, but I get enough
resistance to be afraid to try to pull it out any farther. Does the
switch (between various degrees of hot/cold) need to come out first,
or is there anything I'll break by pulling this out?

I just want some reassurance that I've tried everything I can before
taking apart the whole dash. Any tips would be appreciated, including
on if it's safe to disconnect one of the 2 vacuum lines behind my
glove compartment while the car is running. I figure I could use my
finger simply to check if any exchange is taking place.

Thanks


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Old 03-21-2005, 17:01   #2 (permalink)
Jerry
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Re: 1989 Tempo GLS - Panel Vents/Vacuum Lines/HVAC Switch

I'm not familiar with your model, but I recently had a HVAC problem, in my
'98 Ford Club Wagon. I did NOT have to disassemble the whole dash. I did
have to do a lot of disassembly of the right part of the HVAC system,
however.
Without studying your account in detail, I would encourage you to localize
your problem. Perhaps you have a bad vacuum motor. An experienced HVAC
person might come along here, if you are real lucky, and tell you where to
look. Absent that, you'll have to deduce the specific problem the old
fashioned way, scratching off some skin from your knuckles along the way.
Yeah, it's OK to temporarily open vacuum lines with a car running. However,
I would caution you against leaving your body in the way of a dashboard
airbag. It could ruin your whole day, if you get punched out that way.
You can buy a vacuum test kit, which has a "pistol-with-vac-gauge." You can
INDUCE vacuum with the pistol, by repeately squeezing. That way, you can
test vacuum motors.
Look for a bound flap, too. Maybe the actuator is OK, but it just can't
budge a flap that has lost its smooth operation over the years.
Good luck.
PS The blender door in my car was actuated with an electrical position
motor, not a vacuum-acutated motor. All other HVAC position motors were
vacuum-actuated.
"IceWizard" <icewizard@suespammers.org> wrote in message
news:phpu31hvjd2vd5krhhfs4vn8gcs7ni7c28@4ax.com...
> I have a 1989 tempo that suddenly decided to no longer allow air to
> come out of the panel vents. I did some troubleshooting, looked up as
> much info I could online and in Chilton's, and I'm currently almost to
> the point of completely taking the dash off. I'm hoping someone else
> with experience can help stop me from spending a whole day attempting
> that.
>
> Basically, air will only come out of the Defrost and Floor.
>
> -- If I choose AC/MAX AC/Panel Vents air will come out of the Window
> Defrost vent.
>
> -- If I choose Defrost it will come out of the Window Deforst Vent.
> -- If I choose Floor it will come out of the Floor vents.
>
> This happens for both heat and cold.
>
> I have come to the conclusion that it is either a vacuum problem or
> somehow related to the vacuum lines.
>
> Behind my glove compartment are 2 vacuum lines, one black and one
> white. They are both fastened tightly and do not appear to be
> leaking. I have not disconnected one yet as I am unsure of if that
> will cause any other problems. Is it safe to remove one of them from
> the connector while the car is running?
>
> If there are only two lines, would the Window/Floor switching seem to
> indicate that these lines are fine, or could one of them be the
> culprit?
>
> Also, has anyone ever pulled out the heating/ac control unit from the
> panel? I have the tools to remove my radio, and the unit has the same
> holes. I can pry it out a little with those tools, but I get enough
> resistance to be afraid to try to pull it out any farther. Does the
> switch (between various degrees of hot/cold) need to come out first,
> or is there anything I'll break by pulling this out?
>
> I just want some reassurance that I've tried everything I can before
> taking apart the whole dash. Any tips would be appreciated, including
> on if it's safe to disconnect one of the 2 vacuum lines behind my
> glove compartment while the car is running. I figure I could use my
> finger simply to check if any exchange is taking place.
>
> Thanks
>
>



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Old 03-21-2005, 18:01   #3 (permalink)
IceWizard
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Posts: n/a
Re: 1989 Tempo GLS - Panel Vents/Vacuum Lines/HVAC Switch

Thanks. I'm thinking it could be the flaps, or a vacuum leak much
farther up. You mentioned a vacuum test kit. I noticed that AutoZone
loans one out for Valvetrain repair. I'm afraid my knowledge of
things that indepth is severely lacking, but would this be along the
lines of what I need?
http://www.autozone.com/servlet/UiBr...acuum_pump.jsp

Or would I want to break down and buy a specific one?

Thanks

On Mon, 21 Mar 2005 16:48:54 -0800, "Jerry" <nothanks@x.com> wrote:

>I'm not familiar with your model, but I recently had a HVAC problem, in my
>'98 Ford Club Wagon. I did NOT have to disassemble the whole dash. I did
>have to do a lot of disassembly of the right part of the HVAC system,
>however.
>Without studying your account in detail, I would encourage you to localize
>your problem. Perhaps you have a bad vacuum motor. An experienced HVAC
>person might come along here, if you are real lucky, and tell you where to
>look. Absent that, you'll have to deduce the specific problem the old
>fashioned way, scratching off some skin from your knuckles along the way.
>Yeah, it's OK to temporarily open vacuum lines with a car running. However,
>I would caution you against leaving your body in the way of a dashboard
>airbag. It could ruin your whole day, if you get punched out that way.
>You can buy a vacuum test kit, which has a "pistol-with-vac-gauge." You can
>INDUCE vacuum with the pistol, by repeately squeezing. That way, you can
>test vacuum motors.
>Look for a bound flap, too. Maybe the actuator is OK, but it just can't
>budge a flap that has lost its smooth operation over the years.
>Good luck.
>PS The blender door in my car was actuated with an electrical position
>motor, not a vacuum-acutated motor. All other HVAC position motors were
>vacuum-actuated.


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Old 03-21-2005, 20:01   #4 (permalink)
Jerry
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Re: 1989 Tempo GLS - Panel Vents/Vacuum Lines/HVAC Switch

Yeah, that's what you want.
Hey, vacuum is vacuum. You don't need to get any specific model.
And if that dashboard airbag deploys, remember to "duck"!
Either think ahead...or think FAST. ...!
On my car, the means to inactivate the airbag was to disconnect the car
battery, and wait 5 minutes. Check you service manual for similar
instructions.
The idea is that, if you're in a crash and the electricity "goes out" in
those critical milliseconds when the airbag must deploy, the airbag system
must have its own reserve of electrical energy to permit the bag to deploy.



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Old 03-22-2005, 08:01   #5 (permalink)
Bob Urz
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Re: 1989 Tempo GLS - Panel Vents/Vacuum Lines/HVAC Switch



Jerry wrote:

> Yeah, that's what you want.
> Hey, vacuum is vacuum. You don't need to get any specific model.
> And if that dashboard airbag deploys, remember to "duck"!
> Either think ahead...or think FAST. ...!
> On my car, the means to inactivate the airbag was to disconnect the car
> battery, and wait 5 minutes. Check you service manual for similar
> instructions.
> The idea is that, if you're in a crash and the electricity "goes out" in
> those critical milliseconds when the airbag must deploy, the airbag system
> must have its own reserve of electrical energy to permit the bag to deploy.
>
>
>

Its not uncommon to have these vacuum motors go out. I had one leaking
on my taurus. As the motor reved up, the air would go from the middle
vents to the defrost! That drove me nuts.

One of my vacuum motors was leaking. I had a handheld vacuum pump with
gauge on it. I pulled the hose on each vacuum motor and put the pump on
it. I then pumped it up and saw if the vacuum motor moved. MOvement is
good. Then, i waited to see if it leaked down. If the motor is bad, it
will leak down to no vacuum quickly.

Bob

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Old 03-23-2005, 18:01   #6 (permalink)
IceWizard
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Re: 1989 Tempo GLS - Panel Vents/Vacuum Lines/HVAC Switch

Thanks. I'll give it a try. Fortunately (or unfortunately, depending
on the case) my car doesn't have airbags so I don't need to worry
about them deploying.

If it was a vacuum motor, do you know approximately where they're
located at? I have diagrams, but they don't really show it in
relation to anything else.


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