I have a 2004 Lexus GX 470 with 230k miles and LOVE THIS CAR. Lately, I have to put maybe 8oz of coolant in every 3 weeks but there are no visible leaks.
Is the head gasket leaking? Should I sell the car? If I do the timing belt, pump, and pulleys might that fix it (needs one now anyway)? Should I spend the money on the belt or get out now?
I would LOVE to keep this thing another 100k miles. It has no other issues and rides like a dream
@gmanken
The first thing I would do is change the Radiator Cap. I had the same problem with our ES350 and the Cap took care of the problem.
@gmanken
Check the water pump, around it for wet signs. Could be the weeping hole leaking that means a new pump is required.
If you're 100% sure there is no coolant leaking I would go to YouTube and check out Scotty's video on head gasket leaks. He has a simple, cheap way of testing the cooling system while it's running to determine if a head gasket has gone bad.
Check the head gasket situation with the Amazon product that Scotty recommended.
It is only 30 bucks but it gives you clear results.
