No clue what to do, My 120y keeps overheating.. and its getting worse =\ .. stays at normal temp for a good 10-15minutes then goes from half way to near the max temp line.... (cold/hot day dosen't matter but worse on hot days)

here is what I have done so far:

New head gasket
New Thermostat
New waterpump
Flushed coolant like 1982429753238795 times (stil crap in radiator.)
Valve timing
silicone hoses

Next thing I'm going to do is replace the Radiator and temp sensor... but what is everyone elses thoughts?

Btw the car runs perfect!

Anthh