ok here's what i think if i'm wrong on these some one pl correct me... ok for the number 3 check your thermostat may be it's stuck or flush your heater core one of the other or do both
and for the number 4 if your charge light and brake light is coming on it means your ALT is on it's way out and get your batt check if it's not good replace it as well when it happned to me i replaced my ALT and my BATT but after while it came back on like with in a week so i took it back to the place that i got it done the son of a B**ch who instoled my ALT has dameged my ALT wiring harnes so i had to replace that too (no charge ) so check your ALT wiring harnes .like i said this is what i think of it so if i'm wrong some body pl corect me
lahiru