Take the guesswork and the do-overs out of a tricky HVAC repair with the Dorman - OE Solutions HVAC Blend Door Actuator 604-990 (also written 604990). This actuator drives the air/blend door inside the HVAC case that controls temperature and airflow through your vents, and it's engineered as a direct-fit replacement for a wide range of GM cars and trucks — including the 2000-2005 Buick LeSabre, 2002-2014 Cadillac Escalade, 1999-2013 Chevrolet Silverado 1500, 2000-2014 Chevrolet Tahoe, 2000-2014 GMC Yukon, 2011-2019 International 4300, and many more. This part covers the MAIN, AUXILIARY, and LOWER MAIN positions, so confirm the correct position for your vehicle before ordering. See the Buyer's Guide tab for the full application list and engine details.
Check the fitment details, application notes, and position to be sure you select the right actuator for your vehicle.
What does this blend door actuator do?
It's a small motor that moves the air/blend door inside the HVAC case, controlling the temperature and airflow directed through your vents.
What position does the 604-990 cover?
This actuator is cataloged for the MAIN, AUXILIARY, and LOWER MAIN positions. Check the fitment details and confirm the correct position for your vehicle before ordering.
Will it fit my vehicle?
It's a direct-fit replacement for many GM cars and trucks, such as the Silverado 1500, Tahoe, Yukon, Escalade and more. See the Buyer's Guide tab for the full list and your exact position.
What are signs this actuator may need replacing?
Common signs include a clicking or knocking noise behind the dash, air not changing temperature, or airflow that won't switch as commanded. Diagnose the cause before replacing.
Does it include mounting hardware?
It features captive screws that stay in place on the actuator to ease alignment inside the HVAC case. Consult the vehicle service information for the correct install procedure.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
