Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Is there a scenario that makes it worse, like AC use, hills, traffic?
When it occurs do you lose coolant?
How often is this occurring?
Based on your repairs the fan would be a possibility. There could be a poor connection causing the radiator fan at times to not run. So the next step will be to watch the gauge, once it starts to rise verify the radiator fan is running. If it is then you can rue that out. The next step is a cylinder compression test. You could have a slight head gasket leak. This will allow combustion pressure to pack air into the cooling system. The cooling system can handle and purge out most air pockets but if it gets overwhelmed it will momentarily stop the flow of coolant.
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You can remove the thermostat and test it in water on the stove with a thermometer to see if it opens correct.
You will only get coolant flow through the top hose when running in the 195-205 range when the thermostat is open, and air in the system cna prevent the thermostat form opening since the thermostat would not have hot coolant up against it to make it open.
Your 0058 O2 sensor code is not related to this issue.
No you can not leave the thermostat out. At times it would make it run to cold and then to hot. The engine runs best at operating temp and the coolant needs time to stop and cool off in the radiator.
This link shows how to drain, fill, bleed https://dl.dropboxusercontent.com/u/90220402/dfb.pdf
If air returns after doing this then the compression test I mentioned prior is needed.
You can try raising the front end off the ground about 6 inches or park aimed up hill to see if you can then get it to bleed.
That means it is bleed as much as it can be. Its now time for a compression test.
I do not believe you have a cracked head. That would result in coolant and oil mixing.
You need to check the compression.
I am going to copy and paste what I wrote from my first answer in case you missed it.
The next step is a cylinder compression test. You could have a slight head gasket leak. This will allow combustion pressure to pack air into the cooling system. The cooling system can handle and purge out most air pockets but if it gets overwhelmed it will momentarily stop the flow of coolant.
Hello again Chris here,