Took it to my parents on Tuesday, the trip is a 4 hour round trip. I ended up taking the ZXW to the garage down the road and they couldn't get it to act up like it was doing 2 days prior. I ended up taking the car out and tried to get it to foam over like it did before but I could not get anything to happen.
We assumed that the long trip got the fluid circulating enough to work all the air out, or got warm enough to evaporate any moisture that could have been in there. So we called it "fixed" for the time being. If anything else happens I'll go from there but for the time being the wagon is doing fine.