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I'm not really familiar with JEEP mechanics but if you've replaced your water pump and it's still overheating with full water/coolant level, you should check the thermostat; when it fails, it's a common cause or overheating in all kind of cars
I'm attaching some links to Youtube tutorial about replacing thermostat in a Jeep but you can expand your Google search using terms
Youtube replace thermostat JEEP Liverty
Hello Martin, I have seen someone install a thermostat upside down . This causes the thermostat to not open . Was the engine overheating before you replaced the water pump and thermostat ? If the engine has been excessively overheated, this could cause a blown head gasket .
Well you could have a bad water pump that is not circulating the water right while you driving you car on high speed but if you wan to try if is the thermostat take off and drive the car like that if the problem goes away just put a new thermostat
Sounds like an overheating problem or lubrication problem. If after it dies you can let it sit for a period to cool down it is most likely a cooling issue. Try removing the Thermostat and see if that seems to help. The thermostat may not be the problem as it could be the water pump not circulating radiator fluid. The reason it takes longer with AC off than with it on is because the strain on the motor is greater with the AC in the On position. Since you didn't mention an overheating issue it is probably a combination of a bad sensor and either faulty Thermostat or faulty water pump. Your also going to want to do a compression check on all cylinders to see if your running high compression on 2 or more indicating a crack in the cylinder wall or a blown head gasket. Lastly there is the oil pump, if that is not circulating oil correctly you will have a lubrication issue that will give you this symptom. If you haven't done so of late do and oil and filter change using gunk engine cleaner additive. This is added to the oil then the engine is run for 5 minutes, then drained. You have to change the oil filter when you use this as running the vehicle with this in the engine will damage the seals.
The symptoms would be the car overheating and not cooling down, Also in some cases the water pump will leak. With a overheating problem its always a good idea to check the thermostat before jumping to water pump. Hope this helped =)
with the engine cold,remove radiator cap.fill w/antifreeze so you can see it.start engine.as engine warm up look for movement or flow of coolant.at normal temp,no flow--water pump bad. if you see bubbles it's a head gasket,quite likely if it was driven while overheated.
Inspect the following: 1.(typical on these models) Possible cooling system caps leak allowing coolant to escape and air into the system. Replace if leaking (there are 2 caps- one cap on the top LH side of the engine and one on the radiator) 2. Radiator fan- This fan on the V-6s are hydraulic driven via powersteering pump, inspect for fluid leaks and proper fluid levels. (To test fan speed, unplug the switch located on the powersteering pump and rev motor to 2000 rpm fan should pick up speed)have it checked if problematic. 3. Replace the thermostat if this hasn't been done in the last 30,000miles, possible binding or stuck (located on the LH side of the engine, under the alternator and at the back end of the coolant feeder pipe). If these all check out fine, inspect or replace the water pump. To replace the pump it requires timing belt removal and or replacement. Hopefully this helps