Power locks in 2008 Ford Focus?

I got a problem with my Focus power locks. Sometimes when I close all doors en the I put the locks with remote control some locks are hard of open again and I have to open manually with risk of broke or damage an internal part.

I went some months ago to change all the actuators so the problem were fixed but some months later the problem returned.

I bought that car in used condition furthermore isn't under warranty.

I wanto to supose if the problem is on remote control or is an electric problem in my car.

Have you ever had and experience like this?

What is wrong with my car? It was shaking and overheating?

Tonight, I was driving back home, i turned on the heater and it blew cold air! I thought maybe because it's a cold night and it would take few minutes to get warm. I decided to go to a drive through and buy a burger. While I was in the drive through line, my car was shaking and I looked at the rpm, it was really low, under 1000rpm. So I put my car on Park and pushed the gas to 3000rpm when I released the pedal, the car turned off. I put the car back on drive and made sure to press the pedal just enough so the car wouldnt turn off. When I roled my window down to get my burgur I heard this loud noise coming from my engine, it sounded like a blow dryer. I went back to the street then I notice my car is overhearting! The pointer for overheating was all the way to the red zone. I turned on the heater again to try, heater was still blowing cold air. So since I was one block from home I just drove the car home. But anyone knows what's going on?
My car is a 2007 ford focus

Which one of these cars would generally last longer?

Assuming that both cars are very well maintained, which would get the most life out of it? http://westernmass.craigslist.org/cto/5249970227.html
or
http://westernmass.craigslist.org/cto/5250364940.html

I was told that Honda's last a million times longer that Ford's but the mileage gap between the two greatly favors the Focus