mestey2004
Seaman Apprentice
- Joined
- Apr 2, 2004
- Messages
- 38
Hi, I have a mercruiser 305 5.0 1999 with a closed cooling system. My problem is I keep getting air in the system. Which of course makes the engine overheat. I have tightened everything I can think of, but the bubbles continue to come out of the fluid fill area. At first I thought that I didnt get all the air out, but the fluid level does not go down as the air comes out. <br /><br />Would a water pump failure cause air bubbles like this? Is there something I sould be coating the hoses with before installing them to get a perfect seal? I have seen no leaks in the system, just air, so the problem should be where there is suction, not pressure. Right? Not sure where to go from here.....<br /><br />Thanks