How to install the blend door actuator on a 2005 Buick LaCrosse cal

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2004 Buick Century A/C Heater Blend Door Actuator

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NOS 2004 BUICK CENTURY HEATER BLEND DOOR ...

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Buick Century for HVAC Vent Actuators for 2004

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Parts Geek https://www.partsgeek.com > Buick Parts > Century Parts
HVAC Heater Blend Door Actuator Set 2 Piece Set - 2004-2005 Buick Century - DIY Solutions 17810-02555053. Review Fitment Notes. Part Number: 17810-02555053.
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The cause of a failed actuator is in almost all cases the blend door sticking to heat warping.

If you have separate heat/cool selections for the driver and the passenger, you have two blend door actuators, otherwise just one. You also have a mode door actuator, a recirculating door actuator, and possibly a defrost door actuator.

Did you replace them ? If not working correctly you probably need to replace it. Do you hear a clicking noise behind the dash ? Does your buick have manual or automatic climate control ? You say blend door actuator ? right or left ? Or mode door ? Mode door would be for moving from floor to vent to defrost . Blend door actuator is Temperature Valve Actuator right or left side.
After replacing one , their is a Actuator Recalibration that must be done . One using a professional scan tool or one that doesn't need a scan tool

Calibration Procedure without a Scan Tool
Turn OFF the ignition.
Remove the battery positive voltage circuit fuse of the Instrument Panel Control Module.
Important: The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.
Wait 60 seconds.
Install the fuse.
You probably don't know where the I/P control module fuse is ?
Fuse is located under the rear seat , left side . Fuse # 37 10amp . HVAC (BATT) .

Might have a bad actuator, which open the access port for warm coolant to enter the heater core.

How To Install Replace AC Heater Temperature Actuator ...

? 4:40
https://www.youtube.com/watch?v=mVP09M7hLB4
Jul 21, 2014 - Uploaded by 1A Auto Parts
http://www.1aauto.com/temperature-blend-door-actuator/i/1ahcx00293 ... How To Remove Install Door Chevy Monte Carlo Pontiac Grand Prix ...

GM Blend Door Actuator Repair (Saturn, Chevy, GMC, Buick ...

? 4:28
https://www.youtube.com/watch?v=fER3ZqnYLZg
Jul 11, 2014 - Uploaded by willmacneill
The procedure is the same for most GM blend door actuatorsfrom 1990-2013 (found in many vehicles made by Chevy, GMC, Buick, Pontiac, ...

Mode/Temperature Door Actuators May Fail : Pontiac ...

Door Lock Mechanism Sticks : Buick LaCrosse Common ...

repairpal.com > Problems > Buick > LaCrosse
Door lock mechanism not operating properly on Buick LaCrosse. Door lockmechanisms ... problem details. 2005 Buick LaCrosse126,000Visitor .... door panel to repair? Lock will neither lock or unlock using key fob but does work manually.

Blend door actuator stuck or vaccume came dissconected. Could also be low on coolant

2008 Lacrosse

Condition: no heat.

Diag: Hot In and Out hoses radiator, hot in and out to Core which means fluid good and thermostat opening. Bled air out of thermostat.

Fix: while listening for click of BLEND DOOR ACTUATOR (Electric CONTROLS) I manual set temp cold to hot back and forth. HEAT now.

Reason: COVID from sitting almost two years due to not needing three cars commute (WFH) since COVID.
Guess they got stuck from sitting there. I kept telling everyone to "exercise" their cars every week or so by driving and not just starting them.

FIXED

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