IGV Posted July 29, 2023 Share Posted July 29, 2023 Hello everyone, I hope everybody is doing ok, I have a question about the coolant in my mack cv713, there's is a black stuff in my coolant reservoir do you guys have any idea of could of been the issue? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted July 29, 2023 Share Posted July 29, 2023 do you have ugly old Black coolant hoses on it anywhere?? could be breaking down.. Quote Link to comment Share on other sites More sharing options...
IGV Posted July 30, 2023 Author Share Posted July 30, 2023 Joey Mack yes sir, I think those hoses hasn't been replaced before they look old, that has to be the issue, you all are always very helpful thank you very much Joey Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted July 30, 2023 Share Posted July 30, 2023 You are very kind... may I suggest, when you drain the coolant, you remove the entire petcock from the lower rad. pipe, drain the coolant, and then, put a garden hose in the top tank on a good flow that seems like it will fill the jackets with some flushing pressure., and flush it clean.. just for kicks you can put a clean bucket under the drain hole, ( I bet it is directly above the axle beam) and watch the water as it goes in the bucket to see that the black crap is flushed out.. if you really want to get nutty, you can remove the thermostats and put the cover back on, and buy new stats, for when you are done.. 1 Quote Link to comment Share on other sites More sharing options...
JoeH Posted July 30, 2023 Share Posted July 30, 2023 Could be oil too. Is it solid or liquid? Oil will float on water. If you have a bad head gasket or oil cooler then oil can cross over into the coolant. 1 Quote Link to comment Share on other sites More sharing options...
Geoff Weeks Posted July 30, 2023 Share Posted July 30, 2023 Oil, soot, rubber or algae, 1st you have to determine what it is, before you can guess at where it came from. 2 Quote Link to comment Share on other sites More sharing options...
IGV Posted July 30, 2023 Author Share Posted July 30, 2023 Thank you everyone for your help, yes Joeh is kind of a solid stuff it is sitting at the bottom of the coolant reservoir 1 Quote Link to comment Share on other sites More sharing options...
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