''Daewoo Matiz Transmission And Air Conditioning Problems'.

Hello Sir,
This is Samuel from India.I own a Daewoo Matiz and the model is as mentioned above.
Problems:
1)Transmission:
Most of the time the 2nd and the reverse gear do not engage easily and requires me to do a lot of extra attempts and efforts.
And recently while driving in top speed a few days ago, the engine knocked over and over like an earthquake within itself, all of a sudden and stopped. It later would start in neutral, but would not move forward and began quaking again when I tried applying the gears.I was shocked and felt absolutely helpless, since at that point I was traveling on a narrow bridge.
However after sometime I managed driving the car back home. It did start moving, but I had to apply the clutch fully and also fully apply the accelerator upto its max and it required me to drive the car constantly at a high speed to keep the engine running.

2)Air Conditioning:
Sir, my car Ac doesn't do anything. When I switch the Ac button on, the engine just squeals loudly and shuts down.

So, these are the 2 major problems my car has. Hence, I request you to kindly provide me your expert solutions for the same. Hope you would help me in this regard.

Thank You,
Samuel,
Karnataka State,
India.