Rick,
The fan is designed to pull air through the radiator, not blow on it. It sounds like your not getting circulation of the coolant. When the t-stat opened and let hot water through to the radiator, cool water should enter the engine at the same time maintaining a balance, not just dump out the overflow. Wrong rotation water pump maybe?
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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