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The final generation of the Buick Century was released in late 1996 for the 1997 model year.

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Little heat from driver side. Others are air temp

My mother in law bought a used Buick Lucerne 2006 a few months ago. The ac works great, the fan runs good at full strength, but I can’t get any heat except for the drivers side vent and it’s not much.
what I’ve done so far is

checked coolant level, replaced thermostat, flushed the heater core, verified actuators move each change, bled air from the system, and flushed entire coolant system.
Both hoses on the heater core are hot, but only the driver side is even warm. What’s happening here!?
Also I’ve been having to add a little antifreeze each time I test it, but I’m not getting drips or anything like it’s leaking out

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If the hoses going to it are both hot then it sounds like you've got coolant flowing through it. You can disconnect the hoses from the heater core and blow some air through to confirm if you have doubts. It sounds like the door isn't moving properly. The actuator might move but if something is broken (like the part where it attaches to the door) then the actuator will move without actually moving the door. Do you have a borescope you can put in there to see if the doors are moving?

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A detached door is what I was thinking also. Didn’t think about a borescope, I was getting ready to tear it up! Guess I’ll be picking one up! Thanks!

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@grandewebos2020 not a problem. Lemme know what you find!

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grandewebos2020 さん、ありがとうございました！
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