I just purchased a 2006 Zephyr.
The engine is leaking coolant. I suspect it's blowing through the overflow/radiator cap. I changed the cap and it improved, but still causes a mist behind the coach. Took it to Cummins MidSouth and the replaced the EGR cooler, and pressure tested it and its not loosing pressure after an overnight test. Just picked it up from Cummins, and still a mist behind the coach with small signs of droplets on the rear of the coach and drip lines on the coach-wide mud flap.
Any suggestions?
BTW, odometer shows only 36,000 miles.