Probably air in the system. Air bubble at thermostat.
Https://www.dodgedurango.net/threads/coolant-bleed-off-how-many-times.7296/
This forum may give you some help. This seems to be a problem with a lot of people.
I have the same exact durango. I changed my radiator die to a leak on the seam. After replacing I had the same issue after tons of research I found that you have to get all of thw air out of the system for proper flow on our Durangos. It has to be burped by reving the motor for about 5 minutes just enough to release the air bubbles but not spill over the coolant. Then after you dont see bubbles someone puts on the radiator cap while you are still reving the motor. Only when the cap is secure let off the gas and continue to put more fluid in THROUGH THE OVERFLOW ONLY. No air will get in. If you open the cap or let off the gas it sucks air back in. It's simular to a vapor lock the air causes pressure and prevents proper circulation. Or when you get a gas bubble in your stomach. Lol
There was a short video that showed the proper way to fill the cooling system back up up in the 02 4.7L durangos
Or you installed the t-stat upside down.
SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat
Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.
SOURCE: 1992 Toyota 4Runner, overheats, radiator,upper
Thanks for choosing FixYa and welcome to the site. Have you checked to see if it is a coolant sensor? Have you checked to make sure the fans are coming on? Are you leaking coolant anywhere? Checked the cap?
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Go back remove the tstat. install the housing without the tstat in it. run for about 5 min. Then take the housing off again and reinstall the tstat. that should fix your overheating problem.
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