Duramax conversion

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Duramax conversion

Postby hummonthis » Thu Mar 08, 2012 7:11 pm

hi I have a 1999 H1 I have had a duramax/allison installed, my mechanic installed an electric fan (not sure why), but it isn't working.It's overheating. Does anyone have an idea on how to go back to the manual version. My mechanic also mentioned a hydraulic type fan system but expensive.
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Vehicle: 1999 H-1

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