4.3L Mercrusier closed cooling overheating problem

Stillreelin

Cadet
Joined
May 3, 2010
Messages
23
Ok take a long story short. I noticed a oil leak in the front of my engine. It turned out being the timing cover. In fixing I had to take off the water pump. I reinstalled the water pump and fill the heat exchanger with anti-freeze. I started the engine an ran it. It would bubble anti-freeze out of the exchanger. Temperature gauge was not reading that it was hot but I could tell it was. Now the day before everything worked perfect. Does anyone no if it can get air locked, if so what would be the best way to bleed the air? I did take out the thermostat and the engine ran cool. Going to order a new thermostat and reinstall. I just want to avoid same problem. System is only about 2 years old.
 
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