Question about 2000 Chevrolet Monte Carlo

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2000 Monte Carlo won't blow out top vents or defroster

A/C and Heat work fine but will not switch from floor to panel vents or defrost

Posted by Anonymous on

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Posted on Jan 02, 2017

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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

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66 chrgr
  • 1011 Answers

SOURCE: my 96 monte carlo climate omly blows on flor and

There is a broken plastic vacuum hose which is goes to the blend door this will be under the hood by the throttle body.With out this vacuum the blend door for the vents will not work.

Posted on Jul 18, 2009

  • 564 Answers

SOURCE: got a 2006 monte carlo and it started blowing air

could be ur selector switch or heater control mod

Posted on Jan 31, 2010

  • 1584 Answers

SOURCE: 1998 chevy monte carlo , can not switch

Problem is in the vaccum feed pipe (Cracked) or the actual control panel.

Posted on Mar 10, 2010

  • 565 Answers

SOURCE: <yn 81 monte carlo -

check the coolant. then outside under the hood near where the 2 hoses go into the heater core there is a heater coolant control valve. make sure the vac line is connected and not broke. feel the hoses there at the heater core after it warms up. are they hot? if not the valve isnt opening and letting coolant into the core

Posted on Jan 22, 2011

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Usually a problem with the blend door under the dash.

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If you are referring to the air won't blow through the defrost vents or on the floor, you may have a stuck or broken blend door actuator. This part diverts air through the different settings: defrost, vent, floor etc. If you aren't getting warm or hot air regardless of the settings, you may either be low on coolant or have a bad thermostat.

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My 1998 Monte Carlo only blows air from the defrost and floor vents but not out pof the middle vents. Can anyone help me please?


It's most likely a vacuum line, look under your hood (close to the cowl panel) for a disconnected, cracked or broken vacuum line.

In some rear cases, it could be the vacuum switch (in dash). Or vacuum diaphragm (under dash).

Hope this helps you ???

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Problem is in the vaccum feed pipe (Cracked) or the actual control panel.

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