Ok guys I need a little advice. I've been going through a million threads on the topic but I'm chasing some minor overheating. Most of the time the coolant temps seems normal, between 185-195*. But climbing long steep grades the coolant temps are rising to close to 215*. Little history. I purchased the truck in December so I don't have a clear picture of is past, but the radiator was replaced not long before I bought the truck. It's a Koyo Radiator that was installed by Safari LTD. Just a few weeks ago a good friend of mine who happens to be a Toyota Master Technician and a Toyota Regional Trainer took care of the PHH for me. While he was there he did a complete coolant flush/swap using Toyota Red (since there was Green in the truck when I bought it). He also replaced the thermostat upper and lower radiator hoses with OEM parts. I have also replaced the fan clutch with a new Blue fan clutch (didn't change the fluid in the new clutch and I'm using it as is), and I put new drive belts on while I was there.
I have no visible coolant leaks and have not noticed any coolant loss. But even with those changes the truck is still heating up on climbs. Today I went to try it again and it reached 212*. If I turn on the heater controls and the heater fan it will cool down to around 200*
I am thinking it is possibly a head gasket on its way out but could use some additional thoughts if anyone has any. Thanks!