Question about 1998 Chevrolet Camaro

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The air flow direction is not changing when the air control knob is turned, the vaccum that moves the damper to direct the air is not operating, what should I do?

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  • Chevrolet Master
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Check the vacuum line that comes through the firewall--make sure it's connected to the intake manifold and no leaks or cracked hose. If this line is good, see if you can access the back of the switch. There is a big vacuum connector you can pull off and check to see that vacuum from the intake is getting to the switch (I think it's usually a black line). If you have vacuum there, you either have a bad switch or bad actuator. Listen for a vacuum leak at the switch with engine running or just as you shut the engine off. If the switch is good and has vacuum, then you should be able to actuate some of the doors. If it only runs to the windshield, then it probably is not getting enough vacuum, as defrost is the default wien there is no vacuum.

Posted on Sep 02, 2010

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1 Answer

I can only get air from the side vents the control knob moves but dosnt change the air flow direction


Denise; You have a blend door malfunction, cable broke, came off, hinge broke, if motor controlled seized, if vacuum controlled could be hose off or cracked.(I think yours is cable and plastic gear type)
I will post links below of the problem and fix.
PRESS THE HELPFUL BUTTON

How to fix stuck heater control knob EVO Boosted Films

http://www.automotiveforums.com/t945781-discuss03_lancer_heater_control_heater_box_fix.html

http://www.automotiveforums.com/t945781-discuss03_lancer_heater_control_heater_box_fix.html

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When i turn my heater on it blow out air on lo speed when i put it on hi hot air move to the defoster


well unfortunately, there is probably not a real easy fix, even the though the problem is probably pretty simple. the air flow in most all cars is directed by vaccume from the engine.. if you look under the dash in the general area of the heater controls, you might be able to see a bunch of plastic or rubber tubes..if there is an air leak in one, then the gate that directs flow does not have enough vaccume to direct the air,.instead the air directs the gate. its an upside wn nightmare usually to get to the....a mechanic or dealership is my suggestion

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1 Answer

Air delivery mode control not changing air flow 2009 Pontiac torrent


Need more information to help solve this problem.
You mean speed of air flow or direction of air flow?
-If direction of air flow no change that mean:
1. Cable from the knob to control door is slip off or if the system is control by vacum. The vacum line is leak or slip off.
-If the peed stay same even move the switch to hight or low:
1. Bad switch.


Mai Lor

Feb 22, 2013 | 2009 Pontiac Torrent

1 Answer

Ac works fine, air direction control works fine no heat,from vents both heater hoses warm


possible climate control problem or the acctuator that opens the door for air flow from heater core. Check for a vaccum leak in the engine compartment or a bad diaphram on the acctuator, and even a bad cable from the control lever/knob.

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1 Answer

Blowers direct air flow only to windshield. Air conditioner is fine as well the heat but will not change


look behind a/c control panel one of the switch brackets that controls the dampers has come loose

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When turn on air it only directs the air flow to your feet and turn switch to other positions it does nothing as per to direct air in those positions.


Sounds like you have lost vacuum in the engine bay,a broken vacuum hose? Most air flow control is done with vacuum operated dampers

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1992 Toyota Camry XLE / air direction control issue


the control is opperated with engine vacumn, check for a hose cracked or come loose in the engine bay, the controller is in the dash,behind the adjustment knob, it may have a hose off or need replacement.

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2 Answers

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There is a vacuum operated actuator that is in the venting system When you switch your control knob, a vaccum pressure is applied to this actuator. Then the actuator moves a flap that controls the warm air/cold air flow. The flap can get stuck, or the actuator can become leaky or weak

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The knob turns on the vent control but it does not change the air


you need to check the control wire is`nt broken most likely come out from flap connection just reconnect and it will work again,check the flap affected for free movement as could be jamming.

Jul 10, 2009 | 2000 Ford Focus

1 Answer

My 1995 ford areostar van when heat is on only blows cold air


The aerostar has a vacuum operated watervalve in the heater tubing.the valve is located on the
passenger side inner fender behind the aircleaner.with someone operating the controls inside the van
you can check to see if you get vaccum by removing the tiny hose that goes to the water valve
and checking for suction as you in the van person operates the heater conthttp://www.fixya.com/PostAnswer.aspx?thid=1323651&prdid=696348rols. If you have no
vaccum there is a break in the hose between the intake manifold and the valve. If you do get
vaccum check to see if the valve changes position from vaccum on to vaccum off. you can see
this motion on the small lever on the side of the valve. If the valve lever doesn't move you can
move it manually to allow the water to flow through the heater core. if the valve won't move manually
there is an obstruction in the valve. If it does move manually the vaccum diaphragm is gone.
replace the valve. if it moves to the manual open position you can hold it open with a tywrap.
before you get to this point you should first check to see that there is enough coolant in the
radiator. If you still have no heat you can check the coolant flow through the heater core. to do
this remove both heater hoses from the valve and pump water from a hose into one of the hoses
water should flow from the other hose. If it doesn't the heater core is blocked. The rear heater
operates the same way with the watervalve under the van just behind the drivers seat.
Good luck.

Dec 02, 2008 | 1995 Ford Aerostar

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