I have 2007 Lacrosse with 90,000 miles.It was doing the some thing all it was is a restricted heater core. Warm the car up to temperature, feel the heater hoses under the hood, at the fire wall if there is a big difference in temperature, it is the problem.I found it easier to take both heater hoses of at the block then run a garden hose into the one that was hottest and let the other one run into a container, Then you will see what washes out. Put them back on and add water you will have heat again, You should flush the whole system because what is happening your antifreeze is wore out. Good luck!
SOURCE: heater blowing cold air Buick Century 2000
does the car not heat up in general? Whats the temp gauge doing and how long of a ride have you tried this for?
SOURCE: 2006 buick Lacross heater blows cold air
check the radiator hoses to see if they are war mto the touch. if cold, the thermostat is seized open
SOURCE: 2007 Buick Lacross says remote start disabled- how do I fix it?
When the service engine soon
light (Also called the check engine light or engine management light)
is turned on this is to alert you to the fact that Powertrain
Control Module (computer) has detected a failure somewhere in the
systems it controls you may not feel any difference in the way the
engine runs, this can be the transmission or the engine or emission
system, there are fault codes set in the modules memory for these
faults. What needs to happen now is to have the powertrain control
module scanned with a special tool called an OBD2 electronic engine
control scanner or a OBD2 code reader. Once the code(s) are read then
you must perform the diagnostics for each code and make the
appropriate repairs based on the findings of the diagnosis that was
performed, this is called doing "Pinpoint" testing.
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The heat gauge reads about half way across. So it appears the thermostat works.
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