2 years ago
Last edited at 3:02PM on 11/6/2011
If you mean why does the heater put out any hot air? Then things like control valves or climate control modules can be the cause. But you will have to let someone actually look at it in person to diagnose it. A more specific question that provides information about your complaint like blower speed or temperature is needed.
First, check the fuses, see if it's blown. If not, go to a repair guy. We have a similar van, don't go to dealer if you can help it. If you are in Dallas, go to Perfect Auto near Harry Hines, he's a great mechanic and won't fix it if it ain't broke.