#1 and #4 are very common problems on these cars. #1 sounds like the blower motor resistor. The part is not that expensive. You'll need a small ratchet set and then search this forum and you'll find instructions to replace it. #4 is a bit more complicated. When I looked into fixing this, I found that I would have to remove airbag assembly and other parts from the steering wheel to replace the switch. Not worth it in my case. I took the advice offered previously on the forum and used a dime to wedge the button when necessary (which isn't very often). good luck
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