tim0421 Posted August 22, 2014 Share Posted August 22, 2014 Ok i have a 1993 rd 688s with a E7-350 motor that is have coolant problems i have replaced thermostat twice all new hoses from top of rad to thermostat housing, new rad, new water filter also a high temp switch still having the problem coolant is flowing into the overflow tank from the main tank any help talked to the dealer they said it could be in the head just not sure no oil in the coolant have also flushed the system a couple of times replaced everything after each flush Quote Link to comment https://www.bigmacktrucks.com/topic/36790-coolant-problems-on-a-93-rd-688/ Share on other sites More sharing options...
gearhead204 Posted August 22, 2014 Share Posted August 22, 2014 Tim does it push more than a gallon ? a eng will push out what coolant doesn't fit in a "hot system" so checking the rad. when cold should have apromx. 1-11 /2 in. of air in top tank of rad. if its expelling more than this you need to do a compression gas test of the cooling system. your dealer should be able t do this also there is a slight chance the air compressor could put sir into the cooling sys. as well 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36790-coolant-problems-on-a-93-rd-688/#findComment-256870 Share on other sites More sharing options...
tim0421 Posted August 22, 2014 Author Share Posted August 22, 2014 it more that a gal that back flows we have caught a little over two and half we leave room for some air in the bottle will look at the compressor thank you for the help Quote Link to comment https://www.bigmacktrucks.com/topic/36790-coolant-problems-on-a-93-rd-688/#findComment-256914 Share on other sites More sharing options...
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