[RD31]

My first thought is to check and make sure that the water pump is pumping water in the correct direction. The water shoud be exiting through the thermostat housing. If not then reroute the belt, or get a water pump that pumps the opposite direction.

If it is pumping the correct direction, bup the engine by squeezing the lower radiator hose multiple times until no air buprs out. Wait 5 to 10 minutes and do it again. Keep doing that until no more aire can be burped. Start the engine and run until warm. Cycle the throttle to get surging of water through your system. Watch your temperature gage - DO NOT LET IT OVERHEAT. Let the system cool completely. You can place a fan over the engine to expedite this process. IMPORTANT - do not open the cap until the engine is cool, or you will have to start the burp process all over again. When cooled down the upper hose should not be pressurized. If it remains pressurized for days after driving then check the coolant system for exhaust gases (could be a blown haed gasket / warped heads).

Robert