How many are there for this car? From what I'm reading there are two, one for each fan. The larger module(#8E0959501N) that controls the large fan is right behind the lower grill. Where is the smaller module(#8E0959501L) that controls the small fan? Are there indeed two modules? Should both fans come on when the ac is on, or just the smaller one? Thanks I'm going nuts trying to work out fan issues.