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Q: i replace radiator and now my coolant resivor starts boiling and i over heat

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I replaced radiator after trying a stop leak that was for blocks and radiator and now I still over heat and now a new problem has occurred my coolant resivori is boiling on top of overheating

My car has 230000 miles.
My car has an automatic transmission.

When you put in the stop leak, you may have blocked some passages and the thermostat. I would remove the thermostat and the lower radiator hose, then run clean water from a hose through the engine and radiator to flush out all the stop leak.

After flushing the entire system out, then install a replacement thermostat and reinstall the lower radiator hose also. Once this is done and the system is refilled with new 50/50 coolant, then you should not overheat.

If it continues to overheat after this then you may have a blown head gasket.

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