Working on a 2008 Chevy trailblazer 4.2.... Have 17.4 update. Could not find any data pids or any bi directional controls for viscous fan clutch.
Viscous fan bi directional controls
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If I recall I had an 04 , 4.2 trailblazer with one of those funky electronic fan clutches I did a Mrs Diagnosis on her as cause of the play in the fan assembly , ordered one and it turned out to be a bad water pump impeller bearing .I had to fire myself for that F-up, drank a beer and ate a water pump.
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