hi. We just got this van maybe 30 days ago. I was on a round trip from Florida to North Carolina and back when the temp gauge spiked and dropped repeatedly. Reservoir was a little low from the middle so I put some water in it (all I had on me). I turned heater onto defrost and tried cooking it that way. There was no boiling over, not really any pressure in top hose.
I drove around 45 mph and it stayed around the 3/4 mark. I found a truck stop and spent the night. The next morning I checked radiator and was full. Drove 386 miles home and it didn't do it. Now a few days later the gauge is bouncing all over again. I have a video but can't seem to load it.