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Pontiac Forum: Hissing sound from vents.
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  #1  
Old December 18th, 2015, 11:29 AM
Stephen0523 Stephen0523 is offline
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Hissing sound from vents.

Hello.

I have a 1989 Pontiac Sunbird LE.

Just recently I have been hearing a hissing sound coming from my vents.

When the fan is in the off position I hear a hissing sound but when the engine revs up is hardly heard at all.

I am thinking it might be the controller but I am not sure.

Any advice would be greatly appreciated.
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Old December 18th, 2015, 12:05 PM
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melsg5 melsg5 is offline
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have you looked under the passenger side dash to see if you can locate the source of the noise, a possible broken or disconnected vacuum line?
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Old December 18th, 2015, 02:55 PM
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EaOutlaw EaOutlaw is offline
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Yes it sounds like a broken or disconnected vacuum line or one mad snake.
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Old April 21st, 2017, 07:04 AM
Stephen0523 Stephen0523 is offline
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Hello all! It has been sometime since I got carried away with life!
My problem has been solved only because I had to replace the control unit and luckily I have a new one on hand! No hissing and everything is working great!
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Old April 21st, 2017, 09:48 AM
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glad to hear you are still with us and have solved the problem
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