Coolant leak out exhaust at cold startup

[little john]

This morning after truck sat all weekend. O started it and went to right side of truck had what looked like oil dripping out of exhaust clamp behind turbo. Wiped it with paper towel and it showed some red. I run red coolant. Egr cooler is on engine but exhaust flow is blocked off to it. And it is demandated with unilevers tune. Took it for a drive to warm engine came back and it quit leaking. Did exhaust gas in coolant test and it passed test. Liquid stayed blue. Not an excessive amount of pressure in coolant tank . And hasn't been using a noticeable coolant. Any ideas?