Also,remember that you might need to bleed air. If you replace the thermoplastic housing with the newer metal one, there is a bleed screw on top of the housing. They put it there for a reason. Start it up, warm it up to op temp. Crack the screw, if all you get is coolant, no problem. If you get air or bubbles, let it all out until you get a slow steady dribble of coolant. Retighten and top up coolant.

[This message has been edited by jeffsr (edited 01-17-2000).]