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2004 Silverado - Changes from cold to full heat when on cold setting



Dual climate slide controls, on cold setting (either with AC on or not)


Driving along and suddenly changes to full heat (both sides)


Adjust heat controls, or turn on AC and still blows full heat.


Resets itself if I turn off the ignition, then re-start the truck

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Sounds like blend door actuator. I had to replace the driver side one on my 04 (easy to do yourself), but if you have both out the passenger one is a real treat...

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