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

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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 cont If you have no
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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.

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