I have a 2007 Beetle, and when I turn the heater on, the air isn't always warm

What is your question?

For example, I start up the car, waiting for the RPMs to reduce before putting into gear. I turn the dial to heat, and the fan to 1. I drive 1/4 mile to the Taco Time, place an order, and by the time I receive it, there's still not heat; it's @ 33 degrees out. When I turn the fan dial to 4, I start to feel the heat , but by the time I'm 1/2 way home, the air is cold. Seems that sometimes I have heat, and other times I don't.

What makes this problem better or worse?

I have not noticed a pattern yet

How long has your 2007 Volkswagen Beetle had this problem?

a few weeks