Losing coolant

2003 TOYOTA HIGHLANDER
180,000 MILES • 3.0L • V6 • 4WD • AUTOMATIC
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JERRY AUGUST
  • MEMBER
  • 2 POSTS
No sign of coolant leak on ground. no water in oil, no oil in water. no white smoke from exhaust. have to add half a gallon of anti freeze every week. car runs great. Does not overheat. Where is this anti-freeze going? what else can I check?
Jul 10, 2017 at 4:13 PM
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HARRY P
  • ✓ASE Certified Mechanic
  • 2,292 POSTS
  • ASE Certified Mechanic
You need to get a cooling system pressure tester and check it out. You can borrow it from AutoZone. Here is a how-to guide: https://www.2carpros.com/articles/radiator-pressure-test

You should not pump it to more than 17 psi though, as that could cause damage. Basically, you are going to pump it up and then listen for a hissing sound. Follow it to your leak. Be sure to check inside the car if you cannot hear it outside (as it could be a leaky heater core). Good luck and let us know what you find.
Jul 10, 2017 at 8:13 PM
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