Ford Ranger over heating problem?

I have a 2004 ranger edge 4.0L V6.

I keep having a an overheating issue only when going up hill.

I tried checking the fan clutch, doesn't even get passed one rotation so I think thats good.

I don't think it is the water pump as that went out on me about 2-3 years ago and was replaced.

Should I do a coolant flush? What are some other test i can do to determine the cause of the problem?

Also it was bubbling/overflowing from the reservoir today (first time that has happened)

Head gasket is the prime suspect. Get a pressure check.
Maybe the radiator is blocked, but also check the thermostat and the fan for correct operation

Pressure test the system for leaks. Check the head gasket with a chemical analyzer. Check for a clogged radiator. Flush and bleed the coolant.

Have a mechanic do a "block test" to find out if the head gasket is bad.

Hi sounds more like the radiator cap needs changing as the spring in the cap has become weak.

Check the radiator for clogs.

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