heat only blows out the floor how do fix it to come out defrost/bi-level
Dec 7, 2009 at 5:35 AM
JACOBANDNICKOLAS
✓Experienced Mechanic
110,246 POSTS
The vents are actuated by engine vacuum. Therefore, you need to check for a leak. Start under the dash and the hood. With the engine running, you may get lucky and hear a hissing.