Quote Originally Posted by ipd View Post
Took it out for a long drive today. Not one issue. I've been researching this even more, and it appears to be a fairly common problem caused by idiot mechanics doing similar "top off" things. I've never had this type of issue with my other vehicles, so I'll be keeping a hawkish eye on it to make sure no 2-bit mechanic pops open the radiator cap. Ever.
If I had to guess, I'd say that any overfilling by such mechanics takes place just because they are under so much pressure to get the job done so fast, so they pour as much in as fast as they can.

Some vehicle manufacturers account for the possibility by having a plug in the thermostat housing that can be removed to allow air to escape during the filling process, although my daily driver even has a second "radiator" cap near the thermostat housing that allows me to open the system there to let air escape and add coolant once the car has been running for a few minutes and the thermostat has opened.

Unfortunately, the VX's cooling system has neither of those options, so you just have to do it old school and do all of the coolant filling and top-offs at the radiator inlet itself.

The key is to let the engine get to operating temps (hot enough that the thermostat has opened and coolant is flowing from the engine to the radiator), observe the level of the coolant in the radiator inlet, and add accordingly at that point.