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Old 04-24-2012, 01:30 PM
wtrskiadic wtrskiadic is offline
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Default hvac control not changing direction of air flow

Ok so today on my way home i noticed that when i had the A/C on it was coming out of the defroster vents and was stuck there would not change the air flow at all but the fan speed and temp controls worked
so Im wonder if this has happened to anyone else and how to fix it
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Old 04-24-2012, 05:00 PM
CUTiger CUTiger is offline
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Default Re: hvac control not changing direction of air flow

That part of the HVAC system is controlled by vacuum, if there is a vacuum leak then the system defaults to defrost. Start by checking the lines under the dash and make sure none of them have come disconnected anywhere.
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Old 04-24-2012, 05:02 PM
FireRanger FireRanger is offline
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Default Re: hvac control not changing direction of air flow

The controls for which vents the air flows out of is vacuum operated. The vacuum line is either broken or disconnected. Follow the line from end to end and find the break:

- Manifold vacuum port on the driver side of the engine
- Wraps around the back of the engine and goes under the air filter box
- There is a vacuum reservoir ball under the air filter box it connects to
- Another line out of the reservoir into the cab behind the glove box
- Into the HVAC control panel
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