WeVRVing (Like that one!) - Easy to miss. But, he posted in the CC owner section. And the heading reflects the year and model (99 Allure).
It's a diesel, assume the 8.3 Cummins.
Lugutus - Not sure if you have the famous 'Fan Controller' that is on our 04 era Allure. Hope others will chime in for sure. But, we've recently fixed an intermittent unknown gremlin, by going to the fan controller harness. Disconnected it and sprayed with with electronic contact cleaner, can air dried it (or wait an hour), used a Q Tip to add dielectric grease, and plugged everything back together. Have not had any repeats of our intermittent problem. And, have added the cleaning maintenance to our annual To Do list.
The fan controller is mounted differently on different CC's. But look towards the back/rear side of the radiator. Shout find it that general area. Ours is a must pinned harness. The fan controller also has metal tubes running to it.
Hope other 99 era Allure owners will pin point the location for you. You can also get a 'How to do a diagnostic check.' on this controller, but searching the Yahoo Country Coach Owner group. If cleaning the harness does not help, this would be the next logical step, I think
Best to you,