Reposting in the correct forum...
Picked up a new LC in October. We had a warm Fall in the NE but now in full heat season. At first I thought I had a door or sunroof seal issue but I have a whistle that is the actually from the HVAC. Easiest described as the sound when one of your windows isn't quite rolled up all the way at highway speeds. After chasing it down there is an obvious whistle coming from the center dash vents when HVAC is set to footwell only mode. In any blend mode (footwell+dash vents or footwell+defrost) or full on dash or defrost it is whisper quiet. I decided to look here to see if anyone else had the issue or maybe there is just a defect with mine. I saw a reference by @Meteor to it in this related heater thread, so this is a design/manufacturing issue. I stuck my boroscope down the center vents to see what I could see. There is a horizontal cylinder with different fluting that rotates its position depending on the mode. No obvious issue. Talked to my buddy who is a Lexus mechanic. He said that the blower box is a unit, and you have to rip the whole dash off to get to it. I am not in a big hurry to have that happen to a truck with 500 miles on it.
Post back if you have the issue and even better if you have had Toyota look at it. If enough people have this issue I will approach Toyota for them to launch an investigation and maybe get a TSB.
Picked up a new LC in October. We had a warm Fall in the NE but now in full heat season. At first I thought I had a door or sunroof seal issue but I have a whistle that is the actually from the HVAC. Easiest described as the sound when one of your windows isn't quite rolled up all the way at highway speeds. After chasing it down there is an obvious whistle coming from the center dash vents when HVAC is set to footwell only mode. In any blend mode (footwell+dash vents or footwell+defrost) or full on dash or defrost it is whisper quiet. I decided to look here to see if anyone else had the issue or maybe there is just a defect with mine. I saw a reference by @Meteor to it in this related heater thread, so this is a design/manufacturing issue. I stuck my boroscope down the center vents to see what I could see. There is a horizontal cylinder with different fluting that rotates its position depending on the mode. No obvious issue. Talked to my buddy who is a Lexus mechanic. He said that the blower box is a unit, and you have to rip the whole dash off to get to it. I am not in a big hurry to have that happen to a truck with 500 miles on it.
Post back if you have the issue and even better if you have had Toyota look at it. If enough people have this issue I will approach Toyota for them to launch an investigation and maybe get a TSB.
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