I hadn't considered the mono valve possibility. I thought that since I had heat, the mono valve was ok. Maybe not?

Yes, it's a newer style (1984 300CD) CCU, though I never knew the older ones were made by CHrysler. Is that what you meant?

By ECU, what are you referring to? Same as the CCU?

Are CCU failures common?

Thanks for the suggestions, I'll be doing my own easter egg hunt this weekend.

Gil