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Lets not start throwing parts at the car only to find out they do not solve the problem.
Get the system filled with 50-50 with everything tight. Start it up and make sure you bleed the system until you get no air or bubbles out of the bleeder.
If the temp gauge is not reading more than half way and you are not loosing coolant (checked with the vehicle cold) and the level in the recovery bottle stays at the same level and you pull the cap and it is full to the top of the point where the cap seal seats.
If the system is not bled properly and or the coolant is not close to 50-50, either of those could be your only problem.
If coolant is vanishing into thin air then the head gasket is suspect.
If the gauge shows it running hot at idle suspect head gskt.
If it runs hot the faster your sustained speed the suspect radiator as long as it is not loosing coolant.
If it boils over and overflows the coolant reservoir then it could be clogged radiator or bad gasket or a combination of both.
Bleed and fill with 50-50 even used 50-50 is fine as long as it's close to 50-50. Proper coolant mix will not boil under 13 PSI pressure until it reaches something like 256 degrees, which is why proper mix, system integrity, and a proper cap with the system bled properly are all critical and interrelated.
regards
Mech
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