- Apr 21, 2018
- Reaction score
- DFW, TX
"Electric" fan: I would pay good money to see someone retrofit one of the electric clutches, to one of the GMT400s.
Here's Hayden's selection:
The Chevy Trailblazer used an electric fan clutch (and presumably GMC / Saab / Oldsmobile / Buick / Isuzu cloans) on some (all?) of its engines. It had the 4.2L I5 and the 5.3L V8, right? Was the "SS" a 5.3L too?
I finished that retrofit actually Friday afternoon. Van stays 185F now on the dot. Its controlled off fan 2 output on the LS PCM, via a relay. The 6.0 LS2 powered the SS and that is what my Hayden was built to replace. Its a severe duty and turns about 50-60% when it is commanded off and about 80-90% when it is on.
A guy on the Express/Savanna group I follow put one on from a 6.6L Van on a 6.5L van. I mounted mine the same way. My van has a newer 3 wire pressure sensor on it. When the ac pressure exceeds Fan 2 setting right after startup the clutch fully engages 5-6 seconds after. Once I am driving around for a few minutes and the interior cools down the pressure drops and the fan clutch releases. The 16" electric puller and the freewheeling clutch have been enough to keep the ac ice cold and the engine at 185F on the dot.
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