A/C problem- 95 Jimmy SLT 4x4

Thanks for the vote of confidence and the light at the end of the tunnel.
I'll let you know. Thanks again Jerry.

Andrew.



On 8/21/07 8:57 PM, in article
1187744224.549532.46170.TakeThisOut@x35g2000prf.googlegroups.com, "blazerman"
wrote:

> On Aug 21, 7:59 pm, AWN wrote:
>> Sorry for the repeat post from alt.autos.4x4.chevy-trucks I thought I cc'd
>> these ngs also... Ooops.
>>
>> Good day,
>>
>> I have searched on this and looked at a few different scenarios but I
>> thought
>> I'd ask if anyone has seen a solution firsthand... My A/C blows very cold,
>> the evap/drier get very cold, the low press switch is fine, new condenser,
>> all
>> good. The problem is that sometimes the air will only blow out under the
>> dash
>> or out the top vents. I canhear a slight 'hiss' like there's a vac leak
>> back
>> there in the dash somewhere (maybe the switch, the connector, elsewhere??).
>>
>> I'm wondering the following:
>>
>> Is it easy to locate and test the blend door/s? I figured if it's vac
>> actuated and there's a leak, that the door is either not opening or not
>> closing properly???
>>
>> Is there any way to 'fix' a broken climate control switch?? The dealer
>> wants
>> a fortune for these and I'm having no luck at the bone yards...
>>
>> I can hear the blower fan blowing like madness but it seems that the air
>> doesn't always make it to the cabin. For some reason, it seems that the
>> problem is intermittent and shows up more when it's hotter than 30 degrees.
>>
>> Have any of you had the same problem?? Did you fix it??
>>
>> Thanks and take care, Andrew.
>
> had a 96 Blazer(I believe the same control assembly) and a GM#
> 16205775 fixed it. The AC Delco short number is: 15-72204. Make
> sure, if you order it, that a 95 is the same no# as a 96. I'd bet it
> is. The hissing that you speak of makes me think that this could be
> your problem also but...They have a current list price of 134.74-you
> may be able to buy cheaper or look again at local yards, internet,
> etc. Good luck Andrew, JP
>
 >> Stay informed about: A/C problem- 95 Jimmy SLT 4x4 

On Aug 21, 7:59 pm, AWN wrote:
> Sorry for the repeat post from alt.autos.4x4.chevy-trucks I thought I cc'd
> these ngs also... Ooops.
>
> Good day,
>
> I have searched on this and looked at a few different scenarios but I
> thought
> I'd ask if anyone has seen a solution firsthand... My A/C blows very cold,
> the evap/drier get very cold, the low press switch is fine, new condenser,
> all
> good. The problem is that sometimes the air will only blow out under the
> dash
> or out the top vents. I canhear a slight 'hiss' like there's a vac leak
> back
> there in the dash somewhere (maybe the switch, the connector, elsewhere??).
>
> I'm wondering the following:
>
> Is it easy to locate and test the blend door/s? I figured if it's vac
> actuated and there's a leak, that the door is either not opening or not
> closing properly???
>
> Is there any way to 'fix' a broken climate control switch?? The dealer
> wants
> a fortune for these and I'm having no luck at the bone yards...
>
> I can hear the blower fan blowing like madness but it seems that the air
> doesn't always make it to the cabin. For some reason, it seems that the
> problem is intermittent and shows up more when it's hotter than 30 degrees.
>
> Have any of you had the same problem?? Did you fix it??
>
> Thanks and take care, Andrew.

Your only problem is a vacuum leak or either a bad vacuum check valve.
The blend door is vacuum operated and when you loose that vacuum you
will get the symptoms you're experiencing. You should be able to fix
this yourself depending on where exactly the leak is. If you look
behind that center console, you should see a bundle of colored vacuum
lines running from the control switch over to the evaporator/heater
core case. You'll also see a check valve located in one of the vacuum
lines. This valve may be going bad. It would be a lot easier to wait
until you hear the leak again and then crawl up under your dash and
see if you can isolate exactly where it is. These vacuum lines don't
naturally deteriorate or break so you might look at where they connect
at the control/case to see if maybe someone accidentally kicked one of
the lines while sitting in the passenger seat.
 >> Stay informed about: A/C problem- 95 Jimmy SLT 4x4 

AWN wrote:

> Sorry for the repeat post from alt.autos.4x4.chevy-trucks I thought I
> cc'd these ngs also... Ooops.
>
>
> Good day,
>
> I have searched on this and looked at a few different scenarios but I
> thought
> I'd ask if anyone has seen a solution firsthand... My A/C blows very
> cold,
> the evap/drier get very cold, the low press switch is fine, new
> condenser, all
> good. The problem is that sometimes the air will only blow out under
> the dash
> or out the top vents. I canhear a slight 'hiss' like there's a vac
> leak back
> there in the dash somewhere (maybe the switch, the connector, elsewhere??).
>
> I'm wondering the following:
>
> Is it easy to locate and test the blend door/s? I figured if it's vac
> actuated and there's a leak, that the door is either not opening or not
> closing properly???
>
> Is there any way to 'fix' a broken climate control switch?? The dealer
> wants
> a fortune for these and I'm having no luck at the bone yards...
>
> I can hear the blower fan blowing like madness but it seems that the air
> doesn't always make it to the cabin. For some reason, it seems that the
> problem is intermittent and shows up more when it's hotter than 30 degrees.
>
> Have any of you had the same problem?? Did you fix it??
>
> Thanks and take care, Andrew.
>
>
As other have wrote, you probably have some vacuum issue. Many of the S
series of that vintage have a ball shaped vacuum reservoirs mounted
under the hood on the drivers side. CHeck all those hoses for condition
and replace any that look cracked or deteriorated. Try to find the check
valve and see if its working. While your at it, check ALL the
vacuum hoses under the hood.

If you have a leaking vacuum motor under the dash, you really need a
hand held vacuum pump of such to trouble shoot it. One with a gauge on
it. Once you take the hose assembly off the control pot, you can feed
vacuum to each vacuum motor through the hoses and then see if the vacuum
leaks down. A leaking vacuum motor or bad hose should start leaking down
quickly. I had a bad actuator on my taurus i trouble shot and found it
using this method.

Bob

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 >> Stay informed about: A/C problem- 95 Jimmy SLT 4x4 

on Tuesday 21 August 2007 04:59 pm, someone posing as AWN took a rock and
etched into the cave:

> Sorry for the repeat post from alt.autos.4x4.chevy-trucks I thought I cc'd
> these ngs also... Ooops.

<snip>

If you need - and if it will help - drop me an email. I've got a Haynes
manual from my long-departed '95 SLE. (I got 150,000 miles in seven years
from that truck.)


It could use a good home.
--
www.perfectreign.com
 >> Stay informed about: A/C problem- 95 Jimmy SLT 4x4 

If it's a leaking vac motor, it ain't a do-it-yourself project. The dealer
had to pull the ENTIRE dash out to fix my 95 Blazer when the vac motor died.


"Bob Urz" wrote in message

>
>
> AWN wrote:
>
>> Sorry for the repeat post from alt.autos.4x4.chevy-trucks I thought I
>> cc'd these ngs also... Ooops.
>>
>>
>> Good day,
>> I have searched on this and looked at a few different scenarios but I
>> thought
>> I'd ask if anyone has seen a solution firsthand... My A/C blows very
>> cold,
>> the evap/drier get very cold, the low press switch is fine, new
>> condenser, all
>> good. The problem is that sometimes the air will only blow out under
>> the dash
>> or out the top vents. I canhear a slight 'hiss' like there's a vac leak
>> back
>> there in the dash somewhere (maybe the switch, the connector,
>> elsewhere??).
>> I'm wondering the following:
>> Is it easy to locate and test the blend door/s? I figured if it's vac
>> actuated and there's a leak, that the door is either not opening or not
>> closing properly???
>> Is there any way to 'fix' a broken climate control switch?? The dealer
>> wants
>> a fortune for these and I'm having no luck at the bone yards...
>> I can hear the blower fan blowing like madness but it seems that the air
>> doesn't always make it to the cabin. For some reason, it seems that the
>> problem is intermittent and shows up more when it's hotter than 30
>> degrees.
>> Have any of you had the same problem?? Did you fix it??
>> Thanks and take care, Andrew.
>>
> As other have wrote, you probably have some vacuum issue. Many of the S
> series of that vintage have a ball shaped vacuum reservoirs mounted under
> the hood on the drivers side. CHeck all those hoses for condition and
> replace any that look cracked or deteriorated. Try to find the check valve
> and see if its working. While your at it, check ALL the
> vacuum hoses under the hood.
>
> If you have a leaking vacuum motor under the dash, you really need a hand
> held vacuum pump of such to trouble shoot it. One with a gauge on it. Once
> you take the hose assembly off the control pot, you can feed vacuum to
> each vacuum motor through the hoses and then see if the vacuum leaks down.
> A leaking vacuum motor or bad hose should start leaking down quickly. I
> had a bad actuator on my taurus i trouble shot and found it using this
> method.
>
> Bob
>
> ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet
> News==----
> http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+
> Newsgroups
> ----= East and West-Coast Server Farms - Total Privacy via Encryption
> =----
 >> Stay informed about: A/C problem- 95 Jimmy SLT 4x4 

I wouldn't think pulling the dash would be fully beyond my scope but it does
sound a little time consuming and tricky. Thanks for the heads up. If it's
the vac motor, what symptoms might I have other than those that I decscribes
already? What exact symptoms did you have before you took it to the dealer
for the RE/RE?

Thanks!
Andrew.



On 8/23/07 8:35 AM, in article Xafzi.22675$U24.18398@bignews5.bellsouth.net,
"curmudgeon" wrote:

> If it's a leaking vac motor, it ain't a do-it-yourself project. The dealer
> had to pull the ENTIRE dash out to fix my 95 Blazer when the vac motor died.
>
 >> Stay informed about: A/C problem- 95 Jimmy SLT 4x4 

I truly appreciate the offer to help but I already have both the Haynes and
Chiltons for my vehicle. Now... If you have an IATN or MOD password....
Thanks again!
Andrew.



On 8/23/07 11:02 AM, in article 5j5lr8F3sslm4U5 RemoveThis @mid.individual.net,
"PerfectReign" wrote:

> If you need - and if it will help - drop me an email. I've got a Haynes
> manual from my long-departed '95 SLE. (I got 150,000 miles in seven years
> from that truck.)
>
>
> It could use a good home.
> --
> www.perfectreign.com
 >> Stay informed about: A/C problem- 95 Jimmy SLT 4x4 

It would only blow air as if it were in defrost mode....nothing out the dash
vents. The vacuum motor that moves the flap to redirect the air had
failed....and defrost is the "failure" mode.
He didn't pull the dash completely out of the car, but disconnected
everything from the firewall and pulled it back away from it so it was like
lying in the front seats. There are either two or 3 of those motors in
there and I had him replace them all while he had it open....I just knew
another would go out a week after the first got replaced



"AWN" wrote in message

>I wouldn't think pulling the dash would be fully beyond my scope but it
>does
> sound a little time consuming and tricky. Thanks for the heads up. If
> it's
> the vac motor, what symptoms might I have other than those that I
> decscribes
> already? What exact symptoms did you have before you took it to the
> dealer
> for the RE/RE?
>
> Thanks!
> Andrew.
>
>
>
> On 8/23/07 8:35 AM, in article
> Xafzi.22675$U24.18398@bignews5.bellsouth.net,
> "curmudgeon" wrote:
>
>> If it's a leaking vac motor, it ain't a do-it-yourself project. The
>> dealer
>> had to pull the ENTIRE dash out to fix my 95 Blazer when the vac motor
>> died.
>>
>
 >> Stay informed about: A/C problem- 95 Jimmy SLT 4x4