SR5 fan clutch problem???

chek if the electric fan is turning on when the ac is turned on

2 things,radiator partially clogged,and/or bad heater core.Fan clutch could also be bad.

It sounds like the thermostat is stuck open. They won't heat up in the winter with the thermostat open.

When your car is warm, everything is at its maximum expansion. Sounds like an overheating issue. But again I am not there to inspect and diagnose it. It could be several things. Winter driving keeps your engine way cooler than summer heat

nope you either don;t have a thermostat in it or it's stuck open

If car heats up quickly and overheats , the problem is the thermostat. The thermostat stays closed and traps coolant in the engine untill it reaches about 185 degrees , than the thermostat opens and allows coolant to flow to the radiator where it is cooled by airflow. ( airflow while driving is usually sufficient ) while idling , or in slow trafic , the fan keeps air moving through the rad. The heater core is strictly for heat in the winter inside the car. The thermostat is the most likely cause of the problem , and even if it was good before , the overheat / boil situation likely cooked it anyways. I am assuming the water pump is still getting turned by a belt. No water circulation by pump would cause same symptom as bad thermostat. Overflow and expansion bottles are designed several different ways on different cars , but the theory is that as the engine heats up and the coolant expands , it goes to the tank. Later , as engine cools down after being shut off , coolant contracts. Radiator is replenished by coolant returning from expansion bottle.

did you ever ad the rad flush and have outside wash
mith look clean but you myth have some debris
stuck in the fins that restric they air flow

your radiator could be getting stopped up. also water pump could be weak. during summer though you have electric fans that should be working. need to check. you can purchase some stuff called water wetter by redline racing oil that will drop water temp 20 degrees which is substantial when a thermostat is usually 180 to 190 and boiling is 212.

I need the answer too

have you checked the water pump and air locks in the system