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Pretty sure it is the fan clutch that needs replacing. Mine did that & after they replaced it, it went away.
Sad to say, something again is making the ticking noise under the hood & it is going back Wednesday.
Will reply with what they find.
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2003 TrailBlazer EXT 4X4 NorthFace Edition. Silver Green over Pewter 
Every option minus the DVD 4 a MoonRoof.
5.3 V8 3.73 Locking Rear.
Performance:
TrueFlow Air Intake
Granatelli Mass Flow Air Sensor
FlowMaster 70 Series SUV Muffler
Predator Power Programmer
Airaid Throttle Body Spacer
Misc.:
Super White headlights 80W & 100W
Fog Lamp bulbs
Billet Grill
XM
Tekonsha Prodigy Brake Box
Valentine 1 Radar
Line Of Fire 49" L.E.D Brake Light
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