The air conditioning seems to work ok, but when I turn the AC off and turn on the heat, it only seems to get warm for short periods of time, when im driving but not always when im driving.
What would be the most common issue that causes this?
It could be a couple things. First, make sure that both heater core hoses are getting hot when you are running the heater. If only one is hot, then chances are you have a plugged heater core. If both are getting hot, then I would recommend checking the blend air door which is located near the heater core and opens and closes based on if you want heat or AC.