Question about 2000 Chevrolet Monte Carlo
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
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
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
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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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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