overheating at 60 mph and above, SOLVED! Options

[xrav22]

Hi there My Celica has been running great and I went on a trip(75mph) to find my fans were not kicking on and my temp was rising above middle to the top of thermometer.
Pretty much had to drive 55 all the rest of the way with heater on). I have searched and read many topics but none seem solved. Idling and in town no problems.

Had seen bad fan switch( not the prob new) in fact it isn't hot enough to get the fans on.
Unplug fan switch to see fans run(did and they run)
Blown head gasket (tailpipe is not smoking at all, oil is fine)
Bad thermostat (did replace once before)
Bad water pump (I did not replace, don't know how old it is) car has 200000
Tilted car air out/ new anti freeze
New radiator (6months old) new cap

I am warming it up to watch it and see if it does anything but it doesn't get too warm just sitting there. The gauge goes to the middle at idle.

has anyone solved this problem or what should I do next funds are avail for the Celica
Thx in advance
Edited

This post has been edited by xrav22: Jan 11, 2015 - 7:49 PM

[richee3]

It's a thermostat issue. It isn't opening fully or maybe it's stuck slightly open. Either way, it's letting some coolant flow through the radiator, enough to keep the engine cool under lower loads, but at higher loads the coolant starts to get too warm since it's not able to flow freely through the radiator. This is why I'll inky use OEM Toyota thermostats.