Defrost air doesn't....
 

......blow against the windshield.
When I turn it on I hear a flap drop or something and then the air is
blocked it seems.....while the blower keeps working the other vents.
Had it in at the stealer's and they wanted 995 of my hard earned dollars to
correct the problem.....yep $995.
I told them to go f#^k themselves and then commenced to get mad.
Any ideas on a fix for this? '97 TJ Sahara
TIA
Cliff

Re: Defrost air doesn't....
 

Sounds like a vacuum leak to me.

Re: Defrost air doesn't....
 

Sounds like a vacuum leak to me.

Re: Defrost air doesn't....
 

Sounds like a vacuum leak to me.

Re: Defrost air doesn't....
 

It isn't a vacuum leak. I have a 97 Tj also, it does the same thing.
The dealership has to actually replace the whole unit behind the dash.
(Load of bullsh$*)
If you go under the dash, on the drivers side, you will notice that the
sound of the flap slaming shut is because there is a rod missing that
is suppose to hold it open.
I know this sounds cheesy, but I used a hanger rod. Cut it to length
and send it down one of the holes down the defrost by the window to
hold open the door. that way air blows on the windshield so it doesn't
fog up.
I really don't know how to fix this problem yet. This summer I plan on
taking apart the dash and pulling the air duct apart and figure out
what the rod is, how it should look like and what made it malfunction.
If you find anything out, due tell.

Re: Defrost air doesn't....
 

It isn't a vacuum leak. I have a 97 Tj also, it does the same thing.
The dealership has to actually replace the whole unit behind the dash.
(Load of bullsh$*)
If you go under the dash, on the drivers side, you will notice that the
sound of the flap slaming shut is because there is a rod missing that
is suppose to hold it open.
I know this sounds cheesy, but I used a hanger rod. Cut it to length
and send it down one of the holes down the defrost by the window to
hold open the door. that way air blows on the windshield so it doesn't
fog up.
I really don't know how to fix this problem yet. This summer I plan on
taking apart the dash and pulling the air duct apart and figure out
what the rod is, how it should look like and what made it malfunction.
If you find anything out, due tell.

Re: Defrost air doesn't....
 

It isn't a vacuum leak. I have a 97 Tj also, it does the same thing.
The dealership has to actually replace the whole unit behind the dash.
(Load of bullsh$*)
If you go under the dash, on the drivers side, you will notice that the
sound of the flap slaming shut is because there is a rod missing that
is suppose to hold it open.
I know this sounds cheesy, but I used a hanger rod. Cut it to length
and send it down one of the holes down the defrost by the window to
hold open the door. that way air blows on the windshield so it doesn't
fog up.
I really don't know how to fix this problem yet. This summer I plan on
taking apart the dash and pulling the air duct apart and figure out
what the rod is, how it should look like and what made it malfunction.
If you find anything out, due tell.

Re: Defrost air doesn't....
 

markdgordon2002 did pass the time by typing:
> It isn't a vacuum leak. I have a 97 Tj also, it does the same thing.
> The dealership has to actually replace the whole unit behind the dash.
> (Load of bullsh$*)
> If you go under the dash, on the drivers side, you will notice that the
> sound of the flap slaming shut is because there is a rod missing that
> is suppose to hold it open.
> I know this sounds cheesy, but I used a hanger rod. Cut it to length
> and send it down one of the holes down the defrost by the window to
> hold open the door. that way air blows on the windshield so it doesn't
> fog up.
> I really don't know how to fix this problem yet. This summer I plan on
> taking apart the dash and pulling the air duct apart and figure out
> what the rod is, how it should look like and what made it malfunction.
> If you find anything out, due tell.

Sounds to me like a vac motor has died or the hose has cracked.

I'd probably start by taking the vac switch out from the dash and
testing all the hoses with a vac pump/gauge (just don't go above
10in of vac, safer on the components) That leak test will give
you an idea where the problem is.

Your gonna need the schematic though. I don't have one for your
application.

It is rare for the switch to fail. Most often it's a rubber L
that connects the hard lines to the vac motors.

Some times it is an actuator arm that cracks or even an internal
spring that gives out.

--
DougW

Re: Defrost air doesn't....
 

markdgordon2002 did pass the time by typing:
> It isn't a vacuum leak. I have a 97 Tj also, it does the same thing.
> The dealership has to actually replace the whole unit behind the dash.
> (Load of bullsh$*)
> If you go under the dash, on the drivers side, you will notice that the
> sound of the flap slaming shut is because there is a rod missing that
> is suppose to hold it open.
> I know this sounds cheesy, but I used a hanger rod. Cut it to length
> and send it down one of the holes down the defrost by the window to
> hold open the door. that way air blows on the windshield so it doesn't
> fog up.
> I really don't know how to fix this problem yet. This summer I plan on
> taking apart the dash and pulling the air duct apart and figure out
> what the rod is, how it should look like and what made it malfunction.
> If you find anything out, due tell.

Sounds to me like a vac motor has died or the hose has cracked.

I'd probably start by taking the vac switch out from the dash and
testing all the hoses with a vac pump/gauge (just don't go above
10in of vac, safer on the components) That leak test will give
you an idea where the problem is.

Your gonna need the schematic though. I don't have one for your
application.

It is rare for the switch to fail. Most often it's a rubber L
that connects the hard lines to the vac motors.

Some times it is an actuator arm that cracks or even an internal
spring that gives out.

--
DougW

Re: Defrost air doesn't....
 

markdgordon2002 did pass the time by typing:
> It isn't a vacuum leak. I have a 97 Tj also, it does the same thing.
> The dealership has to actually replace the whole unit behind the dash.
> (Load of bullsh$*)
> If you go under the dash, on the drivers side, you will notice that the
> sound of the flap slaming shut is because there is a rod missing that
> is suppose to hold it open.
> I know this sounds cheesy, but I used a hanger rod. Cut it to length
> and send it down one of the holes down the defrost by the window to
> hold open the door. that way air blows on the windshield so it doesn't
> fog up.
> I really don't know how to fix this problem yet. This summer I plan on
> taking apart the dash and pulling the air duct apart and figure out
> what the rod is, how it should look like and what made it malfunction.
> If you find anything out, due tell.

Sounds to me like a vac motor has died or the hose has cracked.

I'd probably start by taking the vac switch out from the dash and
testing all the hoses with a vac pump/gauge (just don't go above
10in of vac, safer on the components) That leak test will give
you an idea where the problem is.

Your gonna need the schematic though. I don't have one for your
application.

It is rare for the switch to fail. Most often it's a rubber L
that connects the hard lines to the vac motors.

Some times it is an actuator arm that cracks or even an internal
spring that gives out.

--
DougW