Losing coolant

JERRY AUGUST

MEMBER
2003 TOYOTA HIGHLANDER
3.0L
V6
4WD
AUTOMATIC
180,000 MILES

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?

Monday, July 10th, 2017 AT 4:13 PM

1 Reply

HARRY P

MECHANIC
2,292 POSTS

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.