Can't necessarliy automatically blame the water pump, check entire cooling system related components , check air flow through radiator and condensor, often overlooked and plugged with bugs and road debris, check all hoses for condition especially for a collasped bottom hose due to your opening system to R&R thermostat... you may have to bleed air from your system ... check coolant condition for specific gravity.. clogged internally radiator, check flow with cap off engine cold pressure relieved watch flow to see when thermostat is opening... should have increased contant flow. check belts for proper tension and condition.
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Over heats during shifting? Could you elaborate better on that please. more details if available.
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