Polaris Posted August 21, 2014 Report Share Posted August 21, 2014 I just bought a 99 STS with the Northstar engine. I love the car but immediately started having problems with the cooling system. So far I have had it flushed and new Dex coolant installed. The cap is new, purge line is flowing and there are no hyddrocarbons in the system. There are no obvious leaks only a little weeping around the cap. And yet, it will lose 1/2 gallon after less than 200 miles. Quote Link to comment Share on other sites More sharing options...
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