OEM Issues
2003 trailblazer,4.2-6 cyl.
OEM code:PO495.(no other codes)
EXPLANATION:cooling fan clutch rpm too high when the ECM has recomended 0%.
PROBABLE CAUSE:(1)open or short circuit condition,(2)cooling fan relay fault,(3)failed cooling fan clutch.
-I had heard clicking sound from under hood,-no more...