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Premium Member
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1,677 Posts
1. suspect blown hg
2. supect bad ignition timing
3. suspect a very tiny leak, possibly heater hose or similar. (evaporating imediately as it leaks out as to leave no evidence)

... not in any particular order.

try this first, perform a pressure test on the cooling system for leaks.
 

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Ever the explorer
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2,391 Posts
clutch fan?
 
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