mackncheese Posted June 17, 2015 Share Posted June 17, 2015 99 rd 690s seems to be losing coolant. I don't think it is a leak. Although a while ago she blew coolant out the overflow. Is there a test to determine if the head gasket has failed. I am not sure a pressure test will show it as the loss is gradual. Also the other day, i had an intermittent engine miss. It was the first day of really hot weather. I don't think the 2 are related but thought I would mention it. Thanks for your time. Quote Link to comment Share on other sites More sharing options...
Kyle 537 Posted June 17, 2015 Share Posted June 17, 2015 How much coolant, a day or couple days? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted June 17, 2015 Share Posted June 17, 2015 Do a bottle test on the radiator and also look for foam inside of the valve covers or at the end of the blow/by tube. Quote glenn akers Link to comment Share on other sites More sharing options...
mackncheese Posted June 17, 2015 Author Share Posted June 17, 2015 I would say a half gallon every 3-400 miles. What is a bottle test? Thanks Quote Link to comment Share on other sites More sharing options...
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