1990 Cherokee AC vents/vacuum reserve question
 

Hi,

I have a 1990 Cherokee Laredo 4.0L 6cyl where the battery leaked and
dissolved some vacuum lines running next to and beneath the battery. This
causes the familiar problem of the dash vents not working with AC or heater.
There apparently is a vacuum reserve bottle somewhere which may have been
partially eaten by battery acid or otherwise have broken/dissolved vacuum
lines going to it.

I have heard about this "reserve bottle" from a number of Jeep newsgroups,
but nobody seems to know where it is or how to get at it. I have heard it is
under the battery, or behind the bumper. I can see broken or dissolved
vacuum lines going from under the battery into what appears to be something
behind the bumper. The Chilton and Haynes Cherokee manuals do not describe
this vacuum reserve reservoir bottle or show it's location.

Is there an easy way to get at the bottle to look at it, replace or repair
it, without either pulling the radiator or taking the bumper off?

I appreciate the time taken to respond to this, the Jeep dealers here in CA
are no help and the shops do not seem to have the ability to fix it
properly.

Thanks in advance,

George

Re: 1990 Cherokee AC vents/vacuum reserve question
 

Hi, George

On my Jeep Comanche the big black vacuum bottle is behind the front grill.
Looks like a small football. You get to it from the front, removing 10
screws and pulling the front plastic grill off. It is easy to get to and
has the vacuum lines just as you describe below the battery. I found mine
installing a new radiator and having to unbolt the condensor from the front
of the radiator.

Good luck, Craig


"George Underdahl" <gunderusi@att.net> wrote in message
news:zK7Za.27161$It3.765922@twister.socal.rr.com.. .
> Hi,
>
> I have a 1990 Cherokee Laredo 4.0L 6cyl where the battery leaked and
> dissolved some vacuum lines running next to and beneath the battery. This
> causes the familiar problem of the dash vents not working with AC or
heater.
> There apparently is a vacuum reserve bottle somewhere which may have been
> partially eaten by battery acid or otherwise have broken/dissolved vacuum
> lines going to it.
>
> I have heard about this "reserve bottle" from a number of Jeep newsgroups,
> but nobody seems to know where it is or how to get at it. I have heard it
is
> under the battery, or behind the bumper. I can see broken or dissolved
> vacuum lines going from under the battery into what appears to be
something
> behind the bumper. The Chilton and Haynes Cherokee manuals do not describe
> this vacuum reserve reservoir bottle or show it's location.
>
> Is there an easy way to get at the bottle to look at it, replace or repair
> it, without either pulling the radiator or taking the bumper off?
>
> I appreciate the time taken to respond to this, the Jeep dealers here in
CA
> are no help and the shops do not seem to have the ability to fix it
> properly.
>
> Thanks in advance,
>
> George
>
>

Re: 1990 Cherokee AC vents/vacuum reserve question
 

Hi George, just heading out to remove mine. I refer to it as the vacuum
blimp... I think Kevin in San Diego came up with that. So, on to business -
it's located inside the bumper on the right side. I think there is 2 6mm
bolts holding it. There doesn't seem to be any short cuts in removing it...
I think the bumper has to come off.
I'll post a follow up when I'm done if I come up with any tricks

-Brian

"George Underdahl" <gunderusi@att.net> wrote in message
news:zK7Za.27161$It3.765922@twister.socal.rr.com.. .
: Hi,
:
: I have a 1990 Cherokee Laredo 4.0L 6cyl where the battery leaked and
: dissolved some vacuum lines running next to and beneath the battery. This
: causes the familiar problem of the dash vents not working with AC or
heater.
: There apparently is a vacuum reserve bottle somewhere which may have been
: partially eaten by battery acid or otherwise have broken/dissolved vacuum
: lines going to it.
:
: I have heard about this "reserve bottle" from a number of Jeep newsgroups,
: but nobody seems to know where it is or how to get at it. I have heard it
is
: under the battery, or behind the bumper. I can see broken or dissolved
: vacuum lines going from under the battery into what appears to be
something
: behind the bumper. The Chilton and Haynes Cherokee manuals do not describe
: this vacuum reserve reservoir bottle or show it's location.
:
: Is there an easy way to get at the bottle to look at it, replace or repair
: it, without either pulling the radiator or taking the bumper off?
:
: I appreciate the time taken to respond to this, the Jeep dealers here in
CA
: are no help and the shops do not seem to have the ability to fix it
: properly.
:
: Thanks in advance,
:
: George
:
:

Re: 1990 Cherokee AC vents/vacuum reserve question
 

Thanks for the input folks - everyone was pretty much correct.

I got under the Jeep and was able to pull off the road protection flap that
attached with those knurled plastic spokes; that allowed me to get at the
vacuum reserve bottle. It is on the right hand side, tucked into the bumper;
it is like a small black football, and it does have two chambers. 3 of the 4
vacuum hoses were eaten through from battery acid, and the one plastic "T"
used was cracked in half.

You can get at it from underneath this way; it is a devil moving around the
thing though. You need to fit your hands into small places around sharp
metal to pull off and replace the vacuum hoses. It would be easier to get at
if you pulled the bumper or removed some of the small cross members, but
faster to just work around it carefully.

I've got the replacement parts, now just waiting for the motor to cool a
little and see if that fixes the vacuum issue.

Thanks again for the help and advice,

George


"George Underdahl" <gunderusi@att.net> wrote in message
news:zK7Za.27161$It3.765922@twister.socal.rr.com.. .
> Hi,
>
> I have a 1990 Cherokee Laredo 4.0L 6cyl where the battery leaked and
> dissolved some vacuum lines running next to and beneath the battery. This
> causes the familiar problem of the dash vents not working with AC or
heater.
> There apparently is a vacuum reserve bottle somewhere which may have been
> partially eaten by battery acid or otherwise have broken/dissolved vacuum
> lines going to it.
>
> I have heard about this "reserve bottle" from a number of Jeep newsgroups,
> but nobody seems to know where it is or how to get at it. I have heard it
is
> under the battery, or behind the bumper. I can see broken or dissolved
> vacuum lines going from under the battery into what appears to be
something
> behind the bumper. The Chilton and Haynes Cherokee manuals do not describe
> this vacuum reserve reservoir bottle or show it's location.
>
> Is there an easy way to get at the bottle to look at it, replace or repair
> it, without either pulling the radiator or taking the bumper off?
>
> I appreciate the time taken to respond to this, the Jeep dealers here in
CA
> are no help and the shops do not seem to have the ability to fix it
> properly.
>
> Thanks in advance,
>
> George
>
>

Re: 1990 Cherokee AC vents/vacuum reserve question
 

In message <zK7Za.27161$It3.765922@twister.socal.rr.com>, "George Underdahl"
wrote:

>Hi,
>
>I have a 1990 Cherokee Laredo 4.0L 6cyl where the battery leaked and
>dissolved some vacuum lines running next to and beneath the battery. This
>causes the familiar problem of the dash vents not working with AC or heater.
>There apparently is a vacuum reserve bottle somewhere which may have been
>partially eaten by battery acid or otherwise have broken/dissolved vacuum
>lines going to it.
>
>I have heard about this "reserve bottle" from a number of Jeep newsgroups,
>but nobody seems to know where it is or how to get at it. I have heard it is
>under the battery, or behind the bumper. I can see broken or dissolved
>vacuum lines going from under the battery into what appears to be something
>behind the bumper. The Chilton and Haynes Cherokee manuals do not describe
>this vacuum reserve reservoir bottle or show it's location.
>
>Is there an easy way to get at the bottle to look at it, replace or repair
>it, without either pulling the radiator or taking the bumper off?
>
>I appreciate the time taken to respond to this, the Jeep dealers here in CA
>are no help and the shops do not seem to have the ability to fix it
>properly.

This is an easy fix. By 'the Jeep dealers her in CA are no help' do you mean
they wouldn't do it for free? Does 'the shops do not seem to have the ability
to fix it properly' mean they won't do it for free either?

Just curious.

>
>Thanks in advance,
>
>George
>

Re: 1990 Cherokee AC vents/vacuum reserve question
 

No, the Jeep shops and dealers out here are generally top notch. I don't
think anyone
expects anything for free when you take you car for in service. In this
case, it was "fixed" 3 times by shops or dealers over the past year, but
simply never fixed properly or the time wasn't taken to dig down and get to
the bottom of it, for whatever reason.


"bllsht" <nospam@invaliddot.net> wrote in message
news:egbajvccl1u1km5ufmrsvdqk9ko0h62k1o@4ax.com...
> In message <zK7Za.27161$It3.765922@twister.socal.rr.com>, "George
Underdahl"
>
> This is an easy fix. By 'the Jeep dealers her in CA are no help' do you
mean
> they wouldn't do it for free? Does 'the shops do not seem to have the
ability
> to fix it properly' mean they won't do it for free either?
>
> Just curious.
>

Re: 1990 Cherokee AC vents/vacuum reserve question
 

In message <aPbZa.27275$It3.785721@twister.socal.rr.com>, "George Underdahl"
wrote:

>No, the Jeep shops and dealers out here are generally top notch. I don't
>think anyone
>expects anything for free when you take you car for in service. In this
>case, it was "fixed" 3 times by shops or dealers over the past year, but
>simply never fixed properly or the time wasn't taken to dig down and get to
>the bottom of it, for whatever reason.

The reason I asked was it sounded like you were knocking the dealers and shops.
It's such a simple fix, it shouldn't have been a problem. If it's been worked
on 3 times, and it's still not fixed, the knock is certainly deserved. :-)

There should be a check valve somewhere in the hose supplying vacuum to the
'football' or maybe built into it. It would be worth checking it for proper
operation to avoid additional problems. It prevents the loss of vacuum to the
A/C system when engine vacuum drops, such as when the engine is under a load.
If it's installed backwards, you won't get air distribution where you want it,
and if it leaks, the air will switch from the A/C vents to the defroster vents
when you're under a load.

You should be able to blow through one side, but not the other. The side you
can't blow through should allow nothing through. If it does, it needs
replacing. The side you can't blow through goes to the engine.




>
>
>"bllsht" <nospam@invaliddot.net> wrote in message
>news:egbajvccl1u1km5ufmrsvdqk9ko0h62k1o@4ax.com.. .
>> In message <zK7Za.27161$It3.765922@twister.socal.rr.com>, "George
>Underdahl"
>>
>> This is an easy fix. By 'the Jeep dealers her in CA are no help' do you
>mean
>> they wouldn't do it for free? Does 'the shops do not seem to have the
>ability
>> to fix it properly' mean they won't do it for free either?
>>
>> Just curious.
>>
>