Question about 2001 Buick Century
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Posted on Jan 02, 2017
Check under your hood for broken or loose vacuum lines. Also, the pot on the hood? i believe, on that one. There should be avacuum line running to it. Looks like a little bowling ball. With your engine running , listen for a hissing.
Posted on Jun 07, 2009
This usually is related to the vacuum reservior tank/cannister or the hose leading to that chamber. Any other vacuum hose leak could cause a similar problem depending upon it's location.
The hose leading to the cannister is usually just a thin single hose/tube leading to the cannister. The system allows vacuum to build up in the vehicle and maintains vacuum on the A/C system under heavy acceleration where a loss of vacuum would cause the A/C to change operation (switching from defrost to other venting and vice-versa) due to the loss.
You could have a cracked vacuum hose, or a cracked cannister.
You can use regular carburetor cleaner in a spray can with a nozzle, and carefully spray the vacuum lines on your vehicle when idling, and should notice a change in RPMs if you spray near a leak. Only spray a small amount at a time and let the engine compartment air out between spraying/testing since this is a flammable product.
This should lead you to identify any leaks.
Posted on Mar 29, 2012
SOURCE: heat and air are not blowing
Usually if the vent system is vac operated, the air will blow out the defrost if the system fails. I am showing a blend door actuator that could have stuck in one place. But it could have vac controls too.
If you can see the actuators that control the direction of air flow you can test them with a vac gauge and hand pump.
You may need to get a used shop manual to get the repair procedures.
Posted on Mar 04, 2013
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