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After replacing the thermostat, what else could make the engine overheat? on 1995 BMW 325i

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There are no visible leaks under pressure.
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If you do not have proper circulation, you can have very erratic fan operation. I don't mean that the water pump is leaking. I am saying that the actual impeller( the blade looking part on the inside) may be damaged causing the coolant not to flow through the engine. One symptom may be 1 radiator hose hot while the other noticeably cooler
You may want to have the water pump checked. If it's a belt driven pump, they have problems with the impeller breaking and not pushing the water through the engine.
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