Two year old thread, but what the yell. Has anyone narrowed this HVAC noise down? I have identical symptoms and it only goes off when first click/dot is selected. Or.....I push a/c on/off button.
I believe there is a vacuum operated valve behind the glove box, the vacuum line under the battery maybe the line that operates this valve. I cannot swear to this fact though without going back over previous threads as the memory is not what it was. ��
This valve did make a noise as I recall when something was amiss.
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Someone stated that they fixed theirs by replacing the Heater/AC controlunit in the Center of the dash. These days this unit is repairable if the electrical contacts on it are Improved by bonding the two sections of the unit together permanently.
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