25 hp Mercury 4 stroke 2008 with cooling problem

Flowjack

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Joined
Apr 4, 2011
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The 1st time I crank up, water comes out the tel-tale fine. After about 1 minute I'll hear a "spitting" sound, like air is mixing with the water. If I idle all the way down I may not have any water coming out. Then the alarm goes off and I'll shut it down. It usually takes about 30 seconds before I can start it again without the alarm going off. Then everything works fine. It only does this the 1st time I start it or if I've fished for a long time before I restart (in other words, when the engine is cold). Impeller or maybe a thermostat problem?
 
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