Heat only blows hot when accelerating..

What is your question?

Weird smell when I idle. When driving the air pressure changes from high to low no matter what setting it's on and the lights in my car dim (when the pressure goes low). Before the pressure picks back up the car squeals. Thermostat fluctuates between 1/4 and 3/4. Faint amount of smoke coming from hood after I stopped and parked the car. I can hear the fan running. 2003 Chevy Venture