Can you turbo and supercharge a car?

I think some motor oil may have gotten into my car’s coolant fluid—it looks wrong now. What does oil and coolant look like when they mix?

I drive a car that’s 12 years old. I took a look in my hood and I saw what I think is a crack on the engine block. This is making me nervous. How much does it cost to fix an engine block?

I live in Florida and going without air conditioning in my car is almost unbearable. My mechanic friend told me that the freon in my AC unit might be stuck and I should remove it and refill it. I’m new to this type of maintenance. So how do I take the freon out of my car’s AC?