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Wow, I can only suggest to replace the battery if you have not already. Have alternator tested to ensure proper charging of system. I have not heard of repeated post breaking issues before in one week.
I'll assume exterior handles. Roll window up and disconnect battery negative. Remove all cover plugs and armrests, door pulls, the window crank and trim-panel screws with screwdriver and putty knife. Remove and disconnect any electrical devices in door panel. Pry units with putty knife and unplug harnesses. Remove trim panel carefully prying loose. Disconnect courtesy light and remove water shield. Detach the lock rods from latch. Unhook them by hand from latch holes. Remove the door handle nuts through the service holes in door frame with socket wrench. Rotate lock cylinder if needed for clearance and pull handle from door. Reverse steps for reassembly. Tools: Wrench set, putty knife, screwdrivers, socket wrench set. Good luck!
Agree, a major overheat is one of the worst things to occur. Components can seize and warp when this happens.
Possibly a broken blend door or blend door actuator.
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Yes you need to replace the CD player. Cost to repair would basically buy a new one anyway.
Don't know your ability level or tool access. Here's a procedure for it, read it and determine for yourself if you want to tackle it. Probably several hours: http://www.ehow.com/how_7961289_replace-head-gasket-dodge-neon.html
Need to know how much you are replacing. From the manifold all the way back or at some other point? Catalytic and muffler too? http://www.autozone.com/autozone/accessories/Performance/Catalytic-Converter/_/N-26h8?filterByKeyWord=catalytic&fromString=search
Here you go complete process and tools required: http://www.ehow.com/how_4531713_replace-bmw-thermostat.html Coolant should be listed in owners manual or call parts store or a dealer to find out. Mix is 50/50 using distilled water not tap water. Some coolants come pre-mixed.
Possible fuel line is corroded and needs replaced or the fuel filter has ruptured. Need to have insp. done.