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I have a 03 civic ex replaced radiator thermostat still overheating and the last time it overheated I got a greyish sludge come out of the radiator cap. Can someone help?

  • You could consider flushing the system - to remove any impurities / sludge which sounds like is in there. – Solar Mike Jul 28 '18 at 17:41
  • Welcome to Motor Vehicle Maintenance & Repair! How does it behave when it's overheating? I mean, are you basing the overheating diagnosis off of what the dash gauge says? When it does overheat, is it "okay" then all of a sudden spikes up to well over normal temperature? Does the radiator itself boil over? What happens? – Pᴀᴜʟsᴛᴇʀ2 Jul 28 '18 at 17:51
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if "greyish sludge" is what I think it is, you blew a head gasket when you overheated it. The greyish sludge is motor oil. It sludges when mixed with antifreeze

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