OK before my regular readers start yelling this is a car site let me say we have touched on several other subjects that I thought were important.When was the last time you checked your dryer vent lint trap.There is a product in certain fabric softeners that will plug the screen and inhibit the passage of air.Place the screen under running water and see if the water will flow through the screen if not it is safe to presume air will not flow smoothlyScrub the screen with a soft brush (toothbrush works)until the water flows. At this time also check the vent tube and outlet for excessive lint build up. My dryer is a little over a year and a half old and there were signs of obstruction on the screen the vent looked fine.