control module

2001 Sebring sedan. 2.7 DOHC I've been having intermediate problems with my A/C. In the normal mode settings, it's hit or miss on whether the air will blow cold or just blow fan air. Messing around one day, I discovered that when I am not having any luck with getting cold air in the normal...

Checked plugs,then checked coil wire with grounding quarter in. from block,no spark,except when key was turned it sparked,on/off.Im novice but read somewhere this was indicator,coil not working?I put a new starter in and it turns over fine.Should I take meter readings at ballast...