Question about 2000 Chevrolet Astro
Blower only blows out the defrost and floor !
Check for a vacuum leak. There is a vacuum hose that goes from the firewall to a tee near the AC evaporator. It runs behind the alternator and has a nasty habit of drying and breaking.
Posted on Aug 07, 2008
Posted on Jun 25, 2008
These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.
Posted on Dec 13, 2008
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
Posted on Feb 23, 2009
Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.
Posted on Oct 06, 2009
Sounds like the switch that closes and opens the door for the changing of air flow is bad.
Posted on Feb 17, 2010
Testimonial: "Thanks, this is the way I will head for repair."
Look for vacuum leaks. System is designed to fail in defrost mode. so.... vac hose off, for example, would cause an issue like you describe.
Posted on Jun 30, 2010
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