I have 3 problems with my car.

I drive a 1989 Mercedes 300E with 710,000km (all original).

Problem 1.

When driving the car I turn the A/C on and it works fine. After about 10 min of driving the heat will kick in. I pull over and turn the car off for about 5 - 10min. I turn the car back on and the cold air comes back. This problem does not happen all the time. I changed the push botton control panel to see if this was the problem but there was no change. (The replacement part was from a wrecking yard).

Problem 2.

I need to change my alternator. This does not look hard to do. The question I have is How do I loosen the tention on the belt to remove the alternator. I see the hollow 13mm bolt but in what direction do I turn it to loosen the belt and how many turns?

Problem 3.

My starter also needs to be replaced. Is this a hard job to do? What is involved in replacing it?

Any help would be great

Thanks

Fab