I have a 2002 Buick Century and my heater will blow air but only heats air occasionally.

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2004 Buick Century A/C Heater Blend Door Actuator

AutoZone https://www.autozone.com > buick > century > 2004

Dorman HVAC Door Actuator 604-107 · Part # 604-107 · SKU # 575021 · limited lifetime warranty Limited-Lifetime Warranty · 4.8. (17). 4.8 out of 5 stars. 17 ...

NOS 2004 BUICK CENTURY HEATER BLEND DOOR ...

eBay https://www.ebay.ca > ... > HVAC Vent Actuators

NOS 2004 BUICK CENTURY HEATER BLEND DOOR ACTUATOR 52404369 HVAC ; Breathe easy. Returns accepted. ; Fast and reliable. Ships from United States. ; Condition. New ...

Buick Century for HVAC Vent Actuators for 2004

eBay https://www.ebay.ca > ... > HVAC Vent Actuators
Dorman 604-107 HVAC Air Door Actuator fits Buick Century · C $42.80 ; 2 Heat Heater A/C Fan Air Vent Blend Door Actuator for Chevy GMC Pickup 15-72971 · C $46.84 ...

2004-2005 Buick Century Air Flap Actuator - DIY Solutions ...

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.
US$47.95

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Theres a manual flap that seperates air from outside,an air from heater near floor under dash.....if stuck will do this.....also if thermostat is old an wont close ,tempature cannot build.....if it has a thermostat,if missing.......wont heat up

Sounds like the wire that adjust the heat plenum door at the control knob has disconnected.Or, the plenum door has broken and will not move.

sounds like heater core went out or is stopped up. Is the floorboard wet on either side of the car? Either flush the system with a cheap kit for about $25 or look at getting a new heater core. Usually these are behind the dash but usually easy to get to.

I just replaced a set of cooling fan motors for this problem, and the connectors on the motors were even melted, had to replace connector pigtails as well, th fans also cools the a/c condenser so if the fans quit then your a/c will not be very cool unless your driving and the air flow will aid like a fan would..

if the fan does not increase speed as turned up replace resistor assembly usually in heater housing under dash.if doesn,t nave separate resistor assy.it is the fan switch

thermostat or bleed cooling system

check the coolant level on your radiator

does the car not heat up in general? Whats the temp gauge doing and how long of a ride have you tried this for?

Sounds like a problem with the "Drivers side temp actuator motor".
Each side has a motor that controlls the temp. door inside the dash for the driver or passenger side. These motors are approx. $75, plus 1 hr. labor to install. See more info here...
http://www.greatautohelp.com/more-buick-questions.html