My durango started overheating this morning. The system definitely looses fluid from somewhere but this has never caused an overheating issue. Where should I start in trying to fix this problem. Whats the order of things to check and parts to change ?

 

find and fix the leak sho uld be #1, the longer it is left alone the more likely it is to cause overheating, if you have let the reservoir run dry then you have your culprit right there