No Defrost
 

Hi,

I've read some posts about the dreaded "blend door" issues, but was
wondering.... I have a 1996 JGC Limited that blows about 90% of the air to
the floor and 10% everywhere else. The actual temp control of the air works
fine, I just cannot change where it's directed to. Is this more likely a
vacuum problem or an electrical problem than an actual blend door problem?

I haven't pulled the anything apart yet but have checked for vacuum leaks
all the to vacuum reservoir. All seems to be fine to that point. Are the
actuators that operate these doors electric or vacuum controlled?

Any insight before I start taking things apart would be great! Thanks!

~ Doug

Re: No Defrost
 

~Doug wrote:
> Hi,
>
> I've read some posts about the dreaded "blend door" issues, but was
> wondering.... I have a 1996 JGC Limited that blows about 90% of the
> air to the floor and 10% everywhere else. The actual temp control of
> the air works fine, I just cannot change where it's directed to. Is
> this more likely a vacuum problem or an electrical problem than an
> actual blend door problem?

Depends on if your automatic climate control or manual.
The automatic uses stepper motors, the manual uses vac.

When your driving, turn it to defrost then let off the gas.
That will increase vac. If the vent moves then you probably
have a leak. If not it might be the link has come off or the
door has stuck.

--
DougW

Re: No Defrost
 

~Doug wrote:
> Hi,
>
> I've read some posts about the dreaded "blend door" issues, but was
> wondering.... I have a 1996 JGC Limited that blows about 90% of the
> air to the floor and 10% everywhere else. The actual temp control of
> the air works fine, I just cannot change where it's directed to. Is
> this more likely a vacuum problem or an electrical problem than an
> actual blend door problem?

Depends on if your automatic climate control or manual.
The automatic uses stepper motors, the manual uses vac.

When your driving, turn it to defrost then let off the gas.
That will increase vac. If the vent moves then you probably
have a leak. If not it might be the link has come off or the
door has stuck.

--
DougW

Re: No Defrost
 

~Doug wrote:
> Hi,
>
> I've read some posts about the dreaded "blend door" issues, but was
> wondering.... I have a 1996 JGC Limited that blows about 90% of the
> air to the floor and 10% everywhere else. The actual temp control of
> the air works fine, I just cannot change where it's directed to. Is
> this more likely a vacuum problem or an electrical problem than an
> actual blend door problem?

Depends on if your automatic climate control or manual.
The automatic uses stepper motors, the manual uses vac.

When your driving, turn it to defrost then let off the gas.
That will increase vac. If the vent moves then you probably
have a leak. If not it might be the link has come off or the
door has stuck.

--
DougW

Re: No Defrost
 

check for vac supply for the hvac at the intake manifold unless u have a atc
systemn then it's all electric and fault codes need to be pulled then go from
there

~Doug wrote:

> Hi,
>
> I've read some posts about the dreaded "blend door" issues, but was
> wondering.... I have a 1996 JGC Limited that blows about 90% of the air to
> the floor and 10% everywhere else. The actual temp control of the air works
> fine, I just cannot change where it's directed to. Is this more likely a
> vacuum problem or an electrical problem than an actual blend door problem?
>
> I haven't pulled the anything apart yet but have checked for vacuum leaks
> all the to vacuum reservoir. All seems to be fine to that point. Are the
> actuators that operate these doors electric or vacuum controlled?
>
> Any insight before I start taking things apart would be great! Thanks!
>
> ~ Doug

Re: No Defrost
 

check for vac supply for the hvac at the intake manifold unless u have a atc
systemn then it's all electric and fault codes need to be pulled then go from
there

~Doug wrote:

> Hi,
>
> I've read some posts about the dreaded "blend door" issues, but was
> wondering.... I have a 1996 JGC Limited that blows about 90% of the air to
> the floor and 10% everywhere else. The actual temp control of the air works
> fine, I just cannot change where it's directed to. Is this more likely a
> vacuum problem or an electrical problem than an actual blend door problem?
>
> I haven't pulled the anything apart yet but have checked for vacuum leaks
> all the to vacuum reservoir. All seems to be fine to that point. Are the
> actuators that operate these doors electric or vacuum controlled?
>
> Any insight before I start taking things apart would be great! Thanks!
>
> ~ Doug

Re: No Defrost
 

check for vac supply for the hvac at the intake manifold unless u have a atc
systemn then it's all electric and fault codes need to be pulled then go from
there

~Doug wrote:

> Hi,
>
> I've read some posts about the dreaded "blend door" issues, but was
> wondering.... I have a 1996 JGC Limited that blows about 90% of the air to
> the floor and 10% everywhere else. The actual temp control of the air works
> fine, I just cannot change where it's directed to. Is this more likely a
> vacuum problem or an electrical problem than an actual blend door problem?
>
> I haven't pulled the anything apart yet but have checked for vacuum leaks
> all the to vacuum reservoir. All seems to be fine to that point. Are the
> actuators that operate these doors electric or vacuum controlled?
>
> Any insight before I start taking things apart would be great! Thanks!
>
> ~ Doug