Hi Martin, there are various reasons for this situation, some easy and quick to fix, others not so. Start at the easy quick end, have you had a look at the cap on the expansion tank? Is the system set up as a "recovery" system, sounds like it probably has been. So the coolant expelled as the engine heats up, is drawn back as it cools down, hence, expansion system. Now, if the seal in the cap is NFG the required system pressure will force fluid past the seal, so could be as simple as a new cap. You mention it expels more fluid after stopping, probably because the coolant continues too heat up as it draws heat from the engine, thus continuing to expand. So, have a look at the expansion tank cap, or for a few coins, get a new one. This is really at the cheap end of the problem range. And as I have no knowledge of the VX engine have no more detailed info, but, this sort of problem often indicates a failed cylinder head gasket, so hang on for further adventurers in 7 ownership. Nigel.