Rad cap should be replaced every few years. I can't even recall how many DSM's I have worked on and while the motor is cool, I pop off the rad cap and point out the cracked seal to the owner. Some people think that as long as coolant isn't leaking out the thermostat housing, it's functioning fine.

Something as simple as this could lead to major engine failure. Glad you got it sorted out Alex. Have a safe trip!

To the rest of you DSM'ers who can't remeber when was the last time you replaced your rad cap, spend $10 and do your car a favour I use the Prestone ones that you can find at Canadian tire. They function just as good as OEM.