Question about 2000 Chevrolet Astro

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A/C Vents

Blower only blows out the defrost and floor !

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  • Anonymous Apr 02, 2009

    low air pressure and only works on defrost.i need vacuum hose diagram for a/c.

  • Anonymous Apr 15, 2009

    2000 Chevy Astro Van rear A/C not working?

  • Anonymous May 01, 2009

    Cold air comes out defrosters only heater is the same way.

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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

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Bad fuse.

Posted on Jun 25, 2008

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  • 124 Answers

SOURCE: heater control 98 chevy s10 blazer

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

  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

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

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

  • 432 Answers

SOURCE: All Air Conditioning blows our the defrost vents

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

  • 31 Answers

SOURCE: Heater blows out dash vents only. Will not blow

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."

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SOURCE: my ac only blows from defrost and floor

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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these repairs are usually best left to an electromechanic but it can be doen by anyone with basic knowledge following the troubleshooting section in repair manual which can be purchase from local parts shop or online haynes or chiltons will do and get a multitester.

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