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Not really sure what to do at this point. My car is overheating on the highway after 10-15 mins and I have to pull over every time to let it cool down/if I rev long enough at 3k~ while I'm bleeding my coolant the temp will also start to creep up. Heater core is hella hot when it gets going so I don't think the system is clogged. So far I've bled the system to high heaven and wasn't getting many bubbles from the heater core drain plug after a while, I've swapped the thermostat twice, the second one being a Toyota OEM one, I've changed the water pump (which was a food processor essentially when I replaced it it was so corroded, I also changed the radiator out so it can't be coolant related I'm thinking. Currently I've got a small oil leak that's dripping from the A/C compressor (not working) so my intuition says it's an oil pump failure since it takes so long to overheat and doing a leak fluid test/compression test didn't show signs of a BHG. Thoughts anyone?
 

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A failed oil pump will not cause an engine to overheat. It will cause it to seize, and at that point there is no doubt.

Did you bleed the coolant by the book? There is also a bleed valve on the radiator and at the engine. The heater core is not the only one. I would suspect that there is still air in the system. Do you ever get bouncing idle? Does the radiator get hot, and is there a temperature difference between the inlet and outlet? Is the situation better for a while after you do a bleed?

There are also other causes for overheating. The ignition could be out of time, the airflow meter could be leaky or defective, the fuel could be of insufficient quality, too much carbon in the cylinders or some other condition that could cause detonation.
 
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