MountainAir05 wrote:
Go up on top and remove cover and you will see drain lines, They are just stopped up, clean them out and you should be OK. Clean the old AC while up there. A every year thing. Unplug from power and gen while doing this.
2 things cause this
1. As you mentioned the drain pan drain holes clogged
2. Another more common cause on older AC units is the AC Gasket has slowly collapsed over the years and the drain holes are touching the roof membrane and cannot drain. Especially true if you have RVP/Coleman AC units which is what Newmar used in 1994.
So, you replace the AC Gasket and clean out the drain pan. Doug
