Sounds like something leaking up front, heater core or radiator. Something
higher than your expansion tank letting air into the system while coolant
flows back to the tank? That's my guesstimate
On Feb 17, 2016 11:42 AM, "Michael McSwain" <michaelmcswain@gmail.com>
wrote:

> My temp gauge is sporadically running a little high and I smell a faint
> sweet smell of coolant so I'm trying to track down the leak(s). So during
> all of this I tried to top off my coolant and noticed something unusual, or
> at least I think it's unusual. So when I look at my expansion tank coolant
> level is just above the upper hose inlet. Last time I did any maintenance
> to my coolant system I think I remember being able to open the expansion
> tank when the van was cold and add coolant if needed.  I also remember
> being able to open the expansion tank with the engine running at around
> 2.5k rpms.  Now no matter what the conditions are, every time I try to open
> the expansion tank the level quickly rises and the tank begins to overflow.
> Is that normal? Does that mean that I have too much coolant in the system
> or could it mean that there is a blockage or restriction somewhere?
> --
> m.
>