From what you have listed , door lock's instrument cluster , radio , HVAC - heating an A/C . An doing it intermittantly an starting to work again after slamming a door or the trunk , I would think a lose ground connection . Most likely in back of the instrument panel somewhere .To be sure , looking at a wiring diagram to see if these thing's share a common ground point . G-200 This would be my first place to look , because everthing that stop's working is grounded here
G200
LH front lower corner of the passenger compartment on the LH front door pillar . You will probably need to remove the plastic kick panel . Do you know what i"m talking about . If not there have the vehicle checked for DTC'S - diagnostic trouble codes , BCM , IPC , HVAC control panel .
SOURCE: 2000 Buick LeSabre Limited electrical problem
u poss have ashort going to computer under dash or undercarpet look for any brunt wires
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