| Re: [GMCnet] fan clutch mystery/ theory [message #316440] |
Sat, 22 April 2017 08:26  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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The heat starts building during the climb in the radiator. It takes time to heat up the fan clutch sensor from the radiator's heat. Thus the fan clutch has no idea that you're climbing a hill when your doing it. As to the fan clutch size. The standard duty unit is designed for a smaller fan then we have. Heavy duty unit is designed for our fan's dia, pitch, and number of blades. Sever duty is for a larger dia fan with more pitch, and blades. Thus the SD unit will have a tendency to be engaged for a longer time then it needs too. As our blade can't put enough load on the clutch to disengage the fan. Bob Dunahugh
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