I'm getting some grief from the heater control unit ('01 Concorde). It will only blow through the vents, no floor or defrost. It has power at the controls, I can hear the beep everytime I try the controls. The car sat in the drive way for the last 6 months. Stuck blendor? Could it be a vaccuum problem? Side note: I just had the engine replaced. Going to have a go at it tonight, any thoughts on where to look 1st?

You can run a self diagnostic on the unit. You set temp at a certain degree and hold some buttons in on the unit and it will cycle through all the settings and give codes. However when I get home to look in my book for exact method,I wont have access to a comp till tuesday,Call a dealer and ask or look in a hanes manual.If the lights are going off and on ,you need another control