Trouble with driver's side door

I have an 01 vw jetta, 82140 miles, and has a 2.0L engine. My car seems to think that my driver's side door is open. This happened about a year ago when the light on my door came on and never turned off. I had to pull the bulb from the light to get it to shut off. My key fob still works when I unlock the car but it will no longer lock the doors. This is also a problem because I don't think the alarm gets set. I have adjusted the striker and latch on the door and changed out the comfort control module but it hasn't fixed the problem. I am also haveing a problem with my temp gauge. Sometimes it works and sometimes it doesn't. I will be driving and it will be working fine but then it drops down to 0. Any info on these issues would be greatly appreciated.