Description: The fan clutch is a kind of constant temperature engine cooling fan, which can rotate freely at low temperature when cooling is not needed, which makes the engine heat up faster and reduces unnecessary load of the engine. As the temperature rises, the clutch is engaged, so that the fan is driven by engine power and moves air to cool the engine. Most fan clutches are viscous or "fluid" couplings combined with bimetallic sensing systems similar to thermostats. Some clutches are electronically controlled (instead of a bimetallic strip). These provide the potential to control the level of participation based on any number of inputs. Common control factors might include engine oil temperature, transmission oil temperature, coolant temperature, AC system pressure and ambient air temperature. Fitment: 2004-2012 Chevrolet Colorado 2004-2012 GMC Canyon 2006 Isuzu i-280 2007-2008 Isuzu i-290 Placement on Vehicle: Front Function: First, control the coolant temperature Second, reduce power loss and reduce fuel consumption Package Content: 1x Brand New Radiator Cooling Fan Clutch Inspecting the Fan Clutch Manually: Step 1 Pop the hood. Before you go looking for your fan clutch, make sure your vehicle is in park, with the engine off and the handbrake firmly engaged. If necessary, use the hood strut to hold the hood up so you can work unobstructed. Step 2 Locate your vehicle?s fan clutch. You'll find the fan clutch bolted to the water pump at the front of the engine compartment, between the radiator and the engine. The entire unit is only about 1 foot (30 cm) tall by 1 foot (30 cm) wide, most of which is the circular fan component. The outer housing may make your vehicle's fan clutch slightly larger, and can be either round or rectangular. Step 3 Examine the unit?s general condition. You?ll be able to tell right away if something is out of place or there?s any major structural damage. On a functional fan clutch, the fan blades will all be lined up neatly inside the housing, which should sit upright with an equal amount of space between the radiator and engine. Step 4 Feel for excess movement in the fan and housing. Wiggle each of the fan blades individually to see if they feel damaged or displaced. Do the same for the metal housing that surrounds the fan itself. Loose, rattling pieces send a loud and clear message that you need to have your fan clutch replaced. Step 5 Spot-check for oil leaks. Run your finger along the edges of the bearing seal on the backside of the fan clutch. If it comes away with a heavy coating of oil, the culprit is either a crack or a faulty seal. Radial streaks are another potential clue?this happens when oil escapes from the clutch and is then blown outward in all directions by the fan. Step 6 Turn the fan by hand. Grab the edge of one of the blades and give it a good push. While there should be a little bit of give, it shouldn?t spin more than three complete rotations. Too much free-wheeling is usually a sign that the clutch is prone to slipping. On the other hand, too much resistance means the clutch is binding and can?t turn freely. In either case, it will need to be replaced. Step 7 Have your fan clutch replaced by a professional. Once you think you?ve uncovered the source of the problem, take your vehicle to a trusted garage for repairs. A qualified mechanic will be able to confirm your findings and take the necessary steps to get the clutch working correctly again. They might even be able to turn up other potential complications that you didn?t catch. Notes: The fan clutch is an indispensable part of the heat dissipation system. Its running state is directly related to the performance of the engine. It needs to be replaced immediately after a failure.