HVAC Blower Motor Relay. 1999 GMC Sierra 1500 Engine: 4.3L V6; 4 Pin Relay No Shroud;. 1999 GMC Sierra 1500 Engine: 4.8L V8; 4 Pin Relay No Shroud;. 1999 GMC Sierra 1500 Engine: 5.3L V8; 4 Pin Relay No Shroud;.
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