Hi, I have a 2009 Jeep Grand Cherokee with the 3.7 V6 with 80,000 miles and I keep having overheating issues recently. The car overheats very quickly even when going out for a drive. I have a new radiator fan assembly (I checked it does funciton properly), I replaced both the lower and upper radiator hoses recently, both the radiator and radiator cap are in good condition and there are no visible coolant leaks and I always check the coolant level as well to make sure the system is full. Here is where it gets strange, I replaced the thermostat twice(one with a failsafe, and one without) but coolant does not flow through. The upper radiator hose did not get hot even when the car was overheating. As a temporary solution, I have been driving without a thermostat and water flows through the radiator just fine and upper hose gets hot and the car stays at a cool temperature. However, the car runs a bit too cold without the thermostat so I am looking for a fix to this problem. Any suggestions would be greatly appreciated thank you.
First do my video test. How to tell if your head gasket is blown. If it isn't odds I need a new radiator. Radiators are aluminum cores and they corrode internally they won't leak. They look okay from the outside but they can't dissipate heat when they age
Put your thermostat in a pot of water on the stove and put the burner on high. As the water reaches the thermostat's rated temperature you should see it open. If not, it is bad. If it does, make sure you install it facing the proper direction. It will not open if put in backwards. Good luck.
