So every once in a while, my A/C starts to sound like it's struggling. The force of the air gets stronger and weaker, and it starts to make a whirring noise (much louder than it should be). The temperature is fine, it's just the blowing air. It will continue like this for weeks or months, then eventually when I start the car (particularly if I'm in my parking garage at work for some reason?!?! - could be a coincidence) the A/C won't blow at all. If I hold my hand near the vent, I can feel cold air - but it's just sitting there, not getting blown into the cabin. However, once the car gets up to 60-70MPH, or if we hit a big enough bump, whatever is stuck or broken gets jogged and the A/C starts blowing again and is good for the rest of the trip. I have taken her in seven times or so over the past three years for this problem. They'll replace a cooling pump, or remove twigs, or tighten something, or replace a seal, and then the A/C works and sounds GREAT for a week or two, and I think it's finally fixed, but then it starts sounding unhealthy again. Has anyone encountered this problem? No one at the dealer knows what it is... Thanks!
It sounds like you might have a vacuum leak in one of the hoses that opens a door in the HVAC unit. The bump you hit jars the door open.
The Prius doesn't use vacuum servo, the vent doors use electric motors Sounds like a fan blower issue. Can be a loose connection, or other things going on The fact the dealership appears clueless to fix it is bad news
There is already a thread on this. I second the suggestion of a problem with the blower motor. http://priuschat.com/forums/gen-ii-...-coming-throught-vents-2007-toyota-prius.html Check this post in particular: http://priuschat.com/forums/gen-ii-...ht-vents-2007-toyota-prius-4.html#post1178104 The dealership problem is just par for the course.
