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2006 Buick Terraza

This is my elderly mother's car, so I try to keep it in good condition for her. However, it seems lately that there has been one failure after another with this car. I want to get her a different vehicle, but for some reason she's attached to this one.

Here is a list of what I have going on:
1. Front console fan and back over head fans for heating and cooling work intermittently. Every now and then, they start to blow air.

2. Cigarette lighter / power plugin doesn't work

3. Doors don't all lock or unlock with the toggling of the door lock button. I have to manually unlock or lock each door. The option of simply hitting the unlock or lock button to engage or disengage the locks no longer works. Also, I might add the Key Fobs stopped working.

4. Air conditioning doesn't blow out as cold as I believe it should. Wondering if this is something I can fix and avoid the high cost of a mechanic?

5. OBD scan tool says I've got a bad thermostat. Engine doesn't heat up to proper temperature. I cold winter temps, it never really warms up.

6. Now Ive got a check engine light showing that I need to check the gas cap. Works fine when I fill the car up. Once gas tank begins to empty, then it shows up again.

7. Sliding doors on both sides are slow to respond to opening. I have to hit the inside open button multiple times to get them to respond and open. Sometimes I have to reach behind the seats and use the manual latch to get the darn thing to respond.

These are the things I'm working on, before having an expensive mechanic work on it, and possibly costing more than the car is worth. Any insight will be greatly appreciated. Thank you!