Quote:
Originally Posted by dhennings  the tank has one inlet at the bottom and the outlet at the top for when the cap releases pressure. is the other one better and if so how are both pipes plumbed into the system |
You just posted as i was posting so I did not see your reply above!
Basically you have an pressurized expansion tank, it needs to be mounted higher than the rad. As the water in the rad heats up it will expand into this tank, it will force out the air in the tank via the blow off valve in the cap. (Check that it is a spring loaded blow off cap, not just a plain cap). When the engine is stopped and it cools down a vacuum is formed that will suck the coolent back into the rad. The little disk valve in the bottom of the cap will allow the air back into the expansion tank.
with this setup you do not really want much coolant in the tank when the engine is cold, if you over fill it it will just get blown out when the engine heats up!
My money is on a big nasty air lock somewhere!
Where does the pipe that connect to the bottom of the expansion tank connect to the rad? if its at a low point then it will be very hard to get the air out of the system. if its at a high point then the air can self bleed to a degree.
Pete