Heater problem
1997 Buick Lesabre 6 cyl Front Wheel Drive Automatic

My heater blows cold air only. The car does not overheat. The check engine light came on when the heat stopped working. All the fans work. It has Radiator fluid in it.

Can you trip the computer and tell us what code is registered in memory? This could be a valuable clue as to your problem. Also, do you have automatic temp. control on your system? Please advise.