I have had multiple fan clutch failures. Both on the 455 and 403. One in
particular on a brand new engine, aluminum radiator, high zoot multi bladed
synthetic fan with custom shroud and "high performance" aluminum water
pump. That one I fixed on the road. "I don' wan to fix no steenkin cooling
system on the road !!" Most of the issues I have had were centered around
the actual fan clutch itself. My best advise, based on painful
experiences, is as follows:
"IF YOU HAVE A FAN CLUTCH THAT WORKS, USE IT. PAY FOR A WARRANTY OR
USE A HIGHLY TRUSTED VENDOR WHO STANDS BEHIND THEIR PRODUCTS. IF THEY ARE
LOCATED ON THE OTHER SIDE OF THE COUNTRY, DON'T BITCH ABOUT THE COST OF
FREIGHT. IT IS A MINIMAL EXPENSE, COMPARED TO FIXING IT ON THE ROAD. "
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Sat, Mar 23, 2019, 10:56 AM Bob Dunahugh via Gmclist <
> I just ran into this for the second time. The clutch for the fan wasn't
> pulling enough air in. To keep the engine coolent at it's proper level.
> First sign is when you start the engine. And there isn't much air coming
> from the engine fan. If you need a new clutch unit. DO NOT install a sever
> service duty clutch. As that one is for a larger fan. Thus it won't
> engage/disengage our fan properly. Bob Dunahugh 78 Royale Iowa
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