FIT THESE VEHICLES - 1996-2003 Blazer,1996-1999 C1500,1996-1999 C1500 Suburban,1996-2000 C2500,1996-1999 C2500 Suburban,1996-2000 C35,1996-2002 C3500,1996-2002 Express 1500,996-2002 Express 2500. DETJTECTION - 1.Fan spins excessively when engine is stopped.2.Poor A/C performance at idle or low vehicle speeds.3.Fan speed does not increase when engine is hot.4.Fan speed does not increase until engine is excessively hot.5.Fan blade tip moves more than 1/4front to back.6.Fan turns roughly or does not turn at all.7.Excessive fan noise at all speeds due to failed bearing.8.Vibration that increases with engine speed.. INSTALLATION - Step 1: Take off the fan shroud;Step 1: Take off the fan shroud;Step 3: Rock from side to side. Step 4: Take off the bolts;Step 4: Take off the bolts;Step 6: Tighten the bolts;Step 7: Put the fan back into the engine.. FEATURES - Turns the fan 70-90% of the shaft speed when engaged for increased cooling;Turns the fan 25-35% of the shaft speed when disengaged;Used with deeper pitch fans (2-1/2"of pitch);Land and groove design with up to 27 square inch of working surface;Identified by finned aluminum face plate and thermal spring on the front.
