Heater Fan Won't Turn Off

[NYtedford]

I have a 2002 Grand Caravan 3.8 L with 122,000 miles. After starting engine yesterday, heater fan suddenly came on full blast and now will not turn off or down using controls on temp. function panel. How do i "pop" the panel to look behind? I'm guessing whole panel must be replaced -should I go with a new unit from dealer or look for used panel online? Ted

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