1999 Chevy Astro test

1999 CHEVROLET ASTRO
98,400 MILES • 6 CYL • AWD • AUTOMATIC
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BILL TIPTON
  • MEMBER
  • 1 POST
How do I check the heater/air conditioner switch which controls what position the air flow doors is in?
May 13, 2010 at 9:31 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Basically you supply vacuum to the input. From there, you switch it and the direction of the vacuum should change. What is happening to the car making you think the switch is bad?
Jun 2, 2010 at 3:43 AM
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