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When one changes the oil filter and cooler housing gaskets the cooling system is opened, some fluid is lost- or the shop may have drained fluid prior to taking the housings apart- that is normal procedure.
The overheat could be due to the system not
Being properly bled of entrapped air after it is closed and topped off. bleed should always be done after the cooling system is opened. Entrapped air in coolant can cause intermittent overheat.
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