This Four Seasons HVAC Blower Relay fits your 1978 GMC K25 and is perfect for a tune up or performance upgrade. .
FOUR SEASONS HVAC Blower Control Switch Fits 1987-1991 GMC V3500
FOUR SEASONS HVAC Blower Motor Connector Fits 1995-2000 Mercury Mystique
FOUR SEASONS HVAC Blower Motor Connector Fits 1986-1987 Ford Tempo
FOUR SEASONS HVAC Blower Control Switch Fits 1987 GMC V1500
FOUR SEASONS HVAC Blower Motor Connector Fits 1995-2003 Ford Windstar
FOUR SEASONS HVAC Blower Motor Connector Fits 1998-2006 Lincoln Navigator
