Cooling system

2005 LEXUS GS 300
180,000 MILES
Avatar
JOSE CASTILLO
  • MEMBER
  • 1 POST
Keep adding coolant but it's not leaking
Mar 30, 2016 at 7:36 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
CARADIODOC
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 34,308 POSTS
Best suspect is a leaking cylinder head gasket. One way to verify that is by adding a small bottle of dark purple dye to the coolant, then check a day or two later with a black light. The dye will show up as a bright yellow stain that you can follow back to the source. Auto parts stores will have the dye, and those that rent or borrow tools should have a black light. If the head gasket is leaking, you'll find the dye inside the tail pipe.
Mar 30, 2016 at 7:51 PM
Advertisement