2007 Western Star with a Detroit 515 Antifreeze leak?

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{"text":"I've got a 2007 Western Star with a Detroit 515 in it. Putting antifreeze in it every few days. No leaks have been found. Do have some white smoke and a bit of loss in power. Oil cooler replaced and pressure tested, no leaks. There's a slight antifreeze smell when I turn on the bunk heater.","pics":"[]","canComment":true}