SOURCE: I have a 2005 buick lacrosse. The heat comes out
u cud also not have enuf coolant or the blend door is malfunctioning-------to flush u drain fluid then hook a water hose to the return flow--u shud hav a pro doit-its messy------there are videos on utube and repair manuals that can assist
SOURCE: heater core removel process on 2006 buick lacrosse
take it to a shop .not for the novel handy person,special tools requied,sorry
SOURCE: how to change a heater core in a 2005 Buick Lacrosse
You should not have to pull the whole dash. Take the plenum apart, loosen the hose clamps, remove the core.
SOURCE: 2006buick lacrosse po449 video diy install
Here's a video on your P0449 code. EVAP Code P0449
SOURCE: Where can I get a step by step guide on replacing heater core on my 2005 Buick lacrosse
Cheap shop manual should have this, available from most parts stores.
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