1996 Chevy Astro

1996 CHEVROLET ASTRO
159,000 MILES • 6 CYL • AWD • AUTOMATIC
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TODDYG
  • MEMBER
  • 4 POSTS
i dont hear any hissing noise to indicate a vacume leak , is there any other reason the ac blows from the defrost vent and not the dash board vents?
Jul 23, 2010 at 1:36 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
I agree with you check vacuum, some systems, if vacuum is lost, it will default to defrost. Your directional doors/actuators all work off vacuum. Your hvac controls which actuator gets vacuum.


https://images.2carpros.com/forum/automotive_pictures/170934_astro_hvac_vacuum_1.jpg

Jul 23, 2010 at 2:48 AM
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