Car Sounds
Chevy Astro
Car Heaters

What would cause a whistling from the heater?


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2010-11-19 04:55:25
2010-11-19 04:55:25

My car was making a noise, although I would describe it as more of a "hissing" sound, from the heater/AC control panel. It turns out to be the heater control assembly that was bad. I was told another possibility when you hear that noise is the water control valve.

sounds like a system with vacuum controls( found in higher price/luxury vehicles ) for changing settings...def.,floor/heat,vent,etc. a cracked hose-or a hose that has popped off of the 'nipple' it fits on. does it change when you change 'mode-heat,def.,etc? also, there is a ' manifold ' where all the air tubes are joined and feed vacuum to move doors,etc. for heat-def. etc... somewhere under dash-passenger side-or near center that can leak at main vacuum feed. it looks like an cow's udder-clear plastic air lines connect there and go to respective controls for heat, def.,vent,etc. move the hoses a bit- with car runnuing-listen for change in volume of 'hissing'. of course-this problem could be at the control valve in the dash where you make the desired changes for heat,def., etc. the control valve is expensive- i have bought/sold vehicles for 40 years. i am a supporter of 'junk yards ',auto recycling businesses. they will pull the part-now you need to find an installer- this is a bit complicated,based on vehicle and location of hissing all of the options for heat,def., etc. operate correctly-try runniong the system "thru the paces" a few times and listem for changes,location-as i said before-good luck...


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A whistling noise indicates a vacuum leak.

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voluntary, you cause your lips to form the shape to whistle, and cause the air to be pushed out. if whistling were involuntary, you would do it without making an effort (like your heart pumping, digesting things, etc)

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A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.

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