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 https://www.bigmacktrucks.com/topic/40514-400hp-e7-etech-vmac-iii-losing-coolant/ 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 https://www.bigmacktrucks.com/topic/40514-400hp-e7-etech-vmac-iii-losing-coolant/#findComment-293655 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 https://www.bigmacktrucks.com/topic/40514-400hp-e7-etech-vmac-iii-losing-coolant/#findComment-293672 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 https://www.bigmacktrucks.com/topic/40514-400hp-e7-etech-vmac-iii-losing-coolant/#findComment-293694 Share on other sites More sharing options...
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