Coolant leak

Tiny
RUSTY TIN MAN
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 167,500 MILES
I have a new radiator but still have a leak somewhere. I do not find any leaks in the hoses, no sign of water in the oil. But every time I stop I have to put water in it. I have put about twenty six to thirty gallons of water in it in the past month. Do not see any leaking under the car either. Where is all this water going?
Thursday, June 1st, 2017 AT 10:14 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
A leaking cylinder head gasket is a good suspect. You did not list an engine size so I can only make general recommendations. Consider adding a small bottle of dark purple dye to the coolant, then check a day later with a black light. The dye will show up as a bright yellow stain that you can follow back to the source. Check inside the tail pipe. If you find the dye there, suspect a head gasket.

You can find the dye at any auto parts store. Those that rent or borrow tools should have a black light.
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Thursday, June 1st, 2017 AT 1:18 PM

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