I been having this black slimy substance develop in my coolant reservior, its sticky to touch and I have no idea why its there and how I can clean it. HElp please
thanks

 

this just happened to me, is your car overheating?

it could be oil, if that shows up in your radiator and reservior you may need a head gasket changed.


every since i changed mine, (its been 2 weeks) no overheating issues or oil in my coolant.

 

thanks, I think ima do that then.

 

i have the same issue... i recently replaced the radiator, flushed the coolant, and cleaned out the bottle and replaced the hose inside and the hose to the tank from the reservoir and it hasnt showed anything since...

 

The coolant seems to still be good, the only thing is there like small specks of black stuff and the lining of the reservior is covered in like the black tar. My car deos not overheat nor does white smoke come out of the exhaust.