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Old 07-24-2011, 06:36 PM   #1
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What the eff does this button do?

I discovered this a couple days ago. There's two lines connected, one is a negative pressure vacuum line, and the other is just a tube going to somewhere. When I depress the button, it sounds like there's a release of pressure, and when I release it there's various squeaking and clunks coming from the dash/firewall. So far I have not noticed a function for the button. It's just dangling there.... What in the world is it?
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Old 07-24-2011, 06:40 PM   #2
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Eject Button, watch out you might be flying out of your seat. I really don't know but good luck.

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Old 07-24-2011, 07:00 PM   #3
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guess something to do with vent for defrost for windshield or dash vent. do you have AC?..Driller
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Old 07-24-2011, 07:04 PM   #4
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It's for the Vacuum motor to control the air intake from the cowl. Better hook it back up if you want to suck fresh air inside...
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Old 07-24-2011, 08:04 PM   #5
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Tis part of your heater controls, the squeaking and clunking sounds you hear is the blend door in the heater box moving.
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Old 07-24-2011, 08:12 PM   #6
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Quote:
Originally Posted by Xpress View Post
It's for the Vacuum motor to control the air intake from the cowl. Better hook it back up if you want to suck fresh air inside...
Quote:
Originally Posted by 1995yj318 View Post
Tis part of your heater controls, the squeaking and clunking sounds you hear is the blend door in the heater box moving.
Sooo why is it just danglin? What exactly does it do when I hit the button, and where is it supposed to be and what should it normally do?


Is it like the toggle switch in newer cars to suck air from outside or recirculate cabin air?
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Old 07-24-2011, 09:17 PM   #7
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Pull out your hvac cluster, it's snapped off from a retainer somewhere on the back there. The mode selector slider actuates that switch. I think that's actually for the heater control valve, that cuts off coolant to the heater core when heat isn't selected. The blend door and mode door are cable operated.
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Old 07-24-2011, 09:48 PM   #8
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So its for A/C? I didnt think I had A/C. Heat works fine. I'm so confused...
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Old 07-24-2011, 10:12 PM   #9
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There is a gate just to the passanger side of the cowl vent. It's operated by a vacuum switch. That button controls the vacuum switch.
When you push the button the gate opens allowing outside air to come in through the vent.
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Old 07-25-2011, 11:51 AM   #10
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If it don't do anything use it as a NOS button . Lol . Good luck with it
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Old 07-25-2011, 05:09 PM   #11
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The vacuum motor switch mounts on the left side towards the back of your heater control panel. The extended switch portion points in through a rectangular hole. As you push the mode selector over to "VENT", you see that it slides over and presses the switch.

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