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Have you checked your distributor? I know it sounds unlikely, but a lot of other 454 owners have had what was believed to be catastrophic failure, but it was only something with the dizzy.
Wow that fan is loud, you've got a Duramax fan modded to fit don't you?
Yea Duramax fan with its wings clipped slightly and EV clutch for a 2007 Trailblazer. It runs based off coolant temperature, transmission temperature and AC pressure. Even not towing in this 109°F weather it is getting a solid workout. The Duramax fan does pull off substantial power in this weather and probably eats 2 mpg but the temperature gauge never moves higher than 210°F even stuck in traffic.
Yes and No. To control it PWM as it is controlled in the TBSS you do. If you want to have it either freewheel or lock you can use the normal fan logic. I had it set up first as a dual fan relay setup. Relay 1 was a 16" electric puller. Relay 2 powered the PWM clutch with 12 volts, basically fully locking the clutch. The electric puller and freewheeling clutch fan kept the engine plenty cool until it got up to about 100°F or with heavy towing. The disadvantage to not PWM controlling it is it takes 20-30 seconds to release again and the clutch is not loosened up over 80% throttle. You definitely KNOW when this clutch is locked in. It ate 15 ft/lbs and 10 hp at the tires on the 350 and even my 383 drags a bit over 4,000-4,500 rpm with it engaged.
