Q: heating and cooling system

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I am having an issue with my Corolla overheating. Recently installed a new thermostat, water pump and head gasket sealant (blue devil). I am leaking coolant but I cannot pinpoint where. Heater in the car blows hot air only when accelerating and braking. (heater core?) I snapped a bolt on the water pump just today however, I see no leakage from that area. Please help I cannot think of any other possibilities. No leaks in hoses either.

Thank you, Jen

My car has 300000 miles.
My car has an automatic transmission.

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