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you don't give the year of the car, but if it is 83 - 96 model, it's possible that the hiss is coming from the vacumn assist for the heater gates. Many of the cars from this era used vacumn from the brake booster to open and close the blend doors for you interior heating and cooling. If you switch control to defrost, vent etc, does it change the airflow properly? Does it change from hot to cold ?

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Q: Have air leak noise or hiss coming from the dash behind the steering wheel when you step on brake it cuts the noise abit thanks?
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