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I have a 2001 Chevy Malibu 3.1 V6 and the heater is blowing hoy air out of the defrost,dash vents and the floor at the same time any ideas of why this is happening?

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  • Cars & Trucks Master
  • 14,585 Answers

Broken vacuum line. Usually breaks on the passenger side. Small black tube.

Posted on Dec 16, 2016

  • Shaun McCollum
    Shaun McCollum Dec 16, 2016

    Thanks Randy and turns out it was a small gray line that came out of the block

  • Randy Ohler Dec 16, 2016

    It's only grey because it is old. Guess I should include this also. Glad you found it.

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Posted on Jan 02, 2017

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  • 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

  • 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

  • 599 Answers

SOURCE: A/C Blows out at feet or through defroster, not through dash

the ac blend door is out of adjustment or the the actuator is not working look behind the glove box and watch the arm move

Posted on Jul 24, 2009

morse008
  • 1111 Answers

SOURCE: 1996 chevy blazer my air on heater will not blow

the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up

Posted on Sep 08, 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

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