If you're driving with your sunroof open, especially as you approach highway speeds you may notice what feels like a pressure change in the cabin, almost like the air is being pumped in and out.
When you open a sunroof on any vehicle an area of low pressure is created. Air inside the cabin tries to come out through the opening but is pushed back by the rushing force.
To solve this problem you only need to crack open one or both of your back windows. This allows air to flow out and breaks the pressure seal.
This isn't a defect with your Chevy Avalanche, as Scottie on the old Star Trek use to say, "you cannot change the laws of physics!"
When you open a sunroof on any vehicle an area of low pressure is created. Air inside the cabin tries to come out through the opening but is pushed back by the rushing force.
To solve this problem you only need to crack open one or both of your back windows. This allows air to flow out and breaks the pressure seal.
This isn't a defect with your Chevy Avalanche, as Scottie on the old Star Trek use to say, "you cannot change the laws of physics!"