my climate control is not working. I took the unit out and tried to remove front panel but it was hung up on the buttons. how do you remove the buttons? 3 clips on the temp knob were loosened and then I moved the knob. When I returned the unit to the car it worked until I moved the temp knob again?

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JOE
2001 E55
1992 400E
1976 Triumph TR-6