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What is your question?
How do you know when your fan clutch needs replacing?
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You have a special electronic fan clutch on your 2003 GMC Envoy. If it fails, The Check Engine Light may turn on and/or the fan noise may become very loud. Fan clutch failure on these vehicles has been reported as a common problem by RepairPal. Please visit the following link for more information - http://repairpal.com/cooling-fan-clutch-may-fail-causing-noise-and-check-engine-light-335