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Old 05-09-2018, 12:25 PM   #1
jvluntzel
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Default Air vents not blowing when accelerating

Hi All!

trying to figure this one out. When I accelerate or hold throttle going up a hill, my air vents inside stop blowing air. I am assuming this has something to due to the fact that the engine is in a 0 vacuum state and some actuator is moving when it shouldnt or vice versa.

Any direction on this is greatly appreciated!
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Old 05-09-2018, 12:30 PM   #2
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iirc there is a one way check valve (black and white) on that hose from the IM that prevents such a thing.

However, you didn't list which vehicle this is and I believe your assessment may be inaccurate or mis-stated but to be clear... your vents are closing off via vac yes? Your blower motor doesn't actually stop running correct? If so, then check that valve.
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Old 05-09-2018, 12:31 PM   #3
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Don't forget to mention, (as always) year make and model.
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Old 05-09-2018, 12:40 PM   #4
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Drive backwards.
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Old 05-09-2018, 12:43 PM   #5
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Vacuum actuator for vent has a torn diaphragm. Common problem. Only source is the junkyard. Sometimes new/nos one pop up on ebay.
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Old 05-09-2018, 01:07 PM   #6
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Quote:
Originally Posted by EivlEvo View Post
iirc there is a one way check valve (black and white) on that hose from the IM that prevents such a thing.

However, you didn't list which vehicle this is and I believe your assessment may be inaccurate or mis-stated but to be clear... your vents are closing off via vac yes? Your blower motor doesn't actually stop running correct? If so, then check that valve.
Easy way is to unplug it (optionally, attach a bit of clean hose) and blow air in each end. If air passes in both directions it's fukt.

If ithe check valve is working, then you have a leak somewhere else in your under-dash vacuum system. Good luck!
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Old 05-09-2018, 02:11 PM   #7
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I've got a spare or two, if that's your problem.
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Old 05-09-2018, 05:35 PM   #8
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Drive backwards.
this is genius. I love it

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Don't forget to mention, (as always) year make and model.
91 volvo 740 wagon non turbo REX

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Originally Posted by EivlEvo View Post
iirc there is a one way check valve (black and white) on that hose from the IM that prevents such a thing.

However, you didn't list which vehicle this is and I believe your assessment may be inaccurate or mis-stated but to be clear... your vents are closing off via vac yes? Your blower motor doesn't actually stop running correct? If so, then check that valve.
Pics of valve if you have any

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Originally Posted by white855T View Post
Vacuum actuator for vent has a torn diaphragm. Common problem. Only source is the junkyard. Sometimes new/nos one pop up on ebay.
pics of diaphragm?

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I've got a spare or two, if that's your problem.
hell yea bro. pm me
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Old 05-09-2018, 05:44 PM   #9
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Pics of valve if you have any

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Old 05-09-2018, 07:36 PM   #10
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Make sure said valve above isn't backwards.
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Old 05-09-2018, 09:13 PM   #11
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Or you have a busted actuator. Break out your hand held vacuum pump and test the circuits.
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Old 05-09-2018, 11:08 PM   #12
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Not uncommon for all the air to be on the floor on a 7/9 climbing a hill with a torn vac servo I’d the check valve and all else works.

In that case,
Add a vacuum pump or crush the car, it’s not worth fixing
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Old 05-10-2018, 07:01 AM   #13
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Originally Posted by Kjets On a Plane View Post
Not uncommon for all the air to be on the floor on a 7/9 climbing a hill with a torn vac servo I’d the check valve and all else works.

In that case,
Add a vacuum pump or crush the car, it’s not worth fixing
Now now then...that's not the TB mentality! There's gotta be a ghetto hack workaround
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Old 05-10-2018, 11:04 AM   #14
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I had this same issue. I installed a vacuum pump with a vacuum switch. No cutting, no cursing. Works well.

Once vac is 2<. it turns on, Once <4 it turns off. It's connected only to the vac source for the HVAC controls.
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Old 05-10-2018, 12:54 PM   #15
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Originally Posted by Ursan View Post
I had this same issue. I installed a vacuum pump with a vacuum switch. No cutting, no cursing. Works well.

Once vac is 2<. it turns on, Once <4 it turns off. It's connected only to the vac source for the HVAC controls.


Could you post more pictures and information?
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Old 05-10-2018, 01:16 PM   #16
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https://forums.tbforums.com/showthre...19#post5412619
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Old 05-10-2018, 01:21 PM   #17
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Here are pictures of a vacuum actuator that is torn and one that is good.



Its easier to just replace part in my opinion.
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Old 05-10-2018, 02:40 PM   #18
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Quote:
Originally Posted by jvluntzel View Post
Now now then...that's not the TB mentality! There's gotta be a ghetto hack workaround
Ursan and I posted the work-around/hack.

Though a world where all 7/9 owners/losers would hurry up and crush those things drove kias/corollas with 100k waranties and wasted the dealer’s time would be wonderful...

Replaced them the “right” way with another near new pnw weather actuator that will just split and go bad in a few short years. Time consuming, more bother than those worthless cars are worth.

Hack in a vac pump and switch! 760s with the early auto climate control came with an aux vac can and loud vac pump anyway

Last edited by Kjets On a Plane; 05-10-2018 at 02:50 PM..
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Old 05-11-2018, 09:42 AM   #19
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Originally Posted by Kjets On a Plane View Post
Ursan and I posted the work-around/hack.

Though a world where all 7/9 owners/losers would hurry up and crush those things drove kias/corollas with 100k waranties and wasted the dealer’s time would be wonderful...

Replaced them the “right” way with another near new pnw weather actuator that will just split and go bad in a few short years. Time consuming, more bother than those worthless cars are worth.

Hack in a vac pump and switch! 760s with the early auto climate control came with an aux vac can and loud vac pump anyway
You have a link to your thread?

Thanks! I am so glad to hear about this workaround :D
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Old 05-15-2018, 02:51 PM   #20
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You have a link to your thread?

Thanks! I am so glad to hear about this workaround :D

I posted a link to the instructions already.
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