Mysterious plugs

I think I should have posted this as a new thread. Sorry about that. Also, I did not put the type of vehicle! Sorry again.

1993 Buick Lesabre Custom- heater fan switches speeds when turning, and sometimes when braking, usually from a lower speed to a higher one. I have replaced the heater control unit because the original was stuck on one setting and the fan quit working altogether. The blower motor itself seems good. I've been messing with this awhile and have the dash taken apart. I can't see any damaged wires or anything on the column and I looked pretty good. I'd appreciate any thoughts.

I didn't know if it might be something to do with these open plugs. I have two open plugs under the hood, with no obvious place to plug them in. I am going to attach pictures and maybe you'll know if the car is missing something or if it is the same deal, just different engines. The first pic is of a green plug near the battery. Everything near it is connected. The second is of a blue plug that is near the air filter (http://motors.shop.ebay.com/Car-Truck-Parts-/6030/i.html?_nkw=Air+Filter), and everything near it is connected also. Again, thanks and have a good one.