BUICK BLOWER FAN RELAY

Does The Fan Switch Control A Relay That Controls The Fan Blower Speed? Where Is He Relay Located. Checked Wires To Heater Fan / Air...

My Blower Motor Started Working On And Off About A Month Ago And Now It Stopped All Together. Is There A Relay In The System. Any Help...

I'm Pretty Sure I Know Its The Blower Motor But Sometimes It Doesn't Work So I Tap On The Little Box Behind The Glove Box And It Comes On...