I have a 1998 Land Rover Discovery with the 4.0 and every time I start it and it runs for more than a minute it starts leaking out of the expansion tank. When I got the vehicle it had no thermostat in it and after putting one in there is still little pressure in the system other than the expansion tank. Can the routing of the two small hoses that come out of the radiator, one going to the expansion tank the other to the throttle body, have any affect on the system. Or is the simple answer to get a new expansion tank and go from there? Any help would be appreciated.