I know this question probably doesnt belong in the "appeance products" section....but i know you all will be willing to help. Last night i went for a drive in my Expy...it was kinda cold outside so i turned on the heat. The engine had already warmed up, but i only got cold air coming from the front vents. I turned on the rear air, and it was nice and warm.....why can't i get heat to the front vents?

 

Have you checked your coolant level?

 

This may sound dumb but are there separate heater cores for the front and back. If not then the heater core would be fine cause the back heats up. Other than that i really dont know what would cause it to blow cold than a broken or clogged heater core.