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Old 11-15-2005, 09:01   #1 (permalink)
sleepdog@optonline.net
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A/C Vacuum Check Valve Problem?

Chasing down a blend door problem on a 2000 Taurus wagon. I only get
air through the defrost ducts.

Following the pin-point tests for the mechanical side of this system, I
get to the A/C vacuum check valve, and it **does not** hold the
specified 15 hg for one minute. Pin point test says to replace the
valve.

However, while at a junk yard the other day I pulled about five of
these valves from other Tauri and saw the same result. None held 15 hg
for one minute.

I'm not convinced this part is the problem, and that buying a new one
would be a waste of $11. The guy at the parts counter says he's never
sold one of these to anyone before.

Any ideas?

Thanks

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Old 11-15-2005, 09:01   #2 (permalink)
Backyard Mechanic
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Re: A/C Vacuum Check Valve Problem?

sleepdog@optonline.net wrote:

> Chasing down a blend door problem on a 2000 Taurus wagon. I only get
> air through the defrost ducts.
>
> Following the pin-point tests for the mechanical side of this system, I
> get to the A/C vacuum check valve, and it **does not** hold the
> specified 15 hg for one minute. Pin point test says to replace the
> valve.
>
> However, while at a junk yard the other day I pulled about five of
> these valves from other Tauri and saw the same result. None held 15 hg
> for one minute.
>
> I'm not convinced this part is the problem, and that buying a new one
> would be a waste of $11. The guy at the parts counter says he's never
> sold one of these to anyone before.
>


esp since they cost 1.98 to make, incl overhead and burden.. and if they
hold that vac for 15 seconds, that's not bad.


Unlit propane torch, engine running... do I have to spell it out?

<grin>



--
Yeh, I'm a Krusty old Geezer, staving off dementia here..DEAL with it!
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Old 11-15-2005, 09:01   #3 (permalink)
Backyard Mechanic
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Re: A/C Vacuum Check Valve Problem?

sleepdog@optonline.net wrote:

> Chasing down a blend door problem on a 2000 Taurus wagon. I only get
> air through the defrost ducts.
>


Wait a minute... I was ASSUMING you see no movement of the blend door
actuator/lever. If it DOES move, stop-stop, then it aint the vacuum.


--
Yeh, I'm a Krusty old Geezer, staving off dementia here..DEAL with it!
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Old 11-15-2005, 10:01   #4 (permalink)
sleepdog@optonline.net
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Re: A/C Vacuum Check Valve Problem?

>> Wait a minute... I was ASSUMING you see no movement of the blend door
>> actuator/lever. If it DOES move, stop-stop, then it aint the vacuum.


Well, if I'm only getting air out of the defrost ducts, is it safe to
assume the doors are not moving? That the actuators are not getting
the proper amount of vacuum? Hence the pin-point test on the check
valve, and my query?

The propane trick won't work here. I'm not chasing an intake vacuum
leak. I think I'm chasing a possible leak on the vacuum resevior that
feeds the blend door actuators, but I defer to your seasoned guidance.

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Old 11-15-2005, 10:01   #5 (permalink)
Backyard Mechanic
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Re: A/C Vacuum Check Valve Problem?

sleepdog@optonline.net wrote:

>>> Wait a minute... I was ASSUMING you see no movement of the blend door
>>> actuator/lever. If it DOES move, stop-stop, then it aint the vacuum.

>
> Well, if I'm only getting air out of the defrost ducts, is it safe to
> assume the doors are not moving? That the actuators are not getting
> the proper amount of vacuum? Hence the pin-point test on the check
> valve, and my query?
>
> The propane trick won't work here. I'm not chasing an intake vacuum
> leak. I think I'm chasing a possible leak on the vacuum resevior that
> feeds the blend door actuators, but I defer to your seasoned guidance.


1. It's safe to assume the door isnt moving... it isnt safe to assume the
actuator isnt moving. Anecdotal evidence of the door breaking loose from
the shaft.

2. It's a vacuum leak.. but that means air is being sucked in, not
'vacuum leaked out' And that air is sucked into... yep... the intake
manifold.

also, of course, listen closely for 'hiss'
--
Yeh, I'm a Krusty old Geezer, staving off dementia here..DEAL with it!
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