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Then run the heater when it gets hot regardless of the outside temperature. The additional cooling provided by the heater core should make the temp drop. 224 is not that terrible. Mercedes stated that their diesels could run as hot as 256 in extreme heat conditions like Houston Texas, but they were cast iron blocks and heads.
If a radiator is out of the budget range right now, you certainly don't want to risk a head gasket.
regards
mech
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