'00 Jetta 2.0 Losing Coolant

What color is the engine oil?

Oil seems okay, thanks.

Haven't done that.

Thanks

Maybe a pinhole leak somewhere. Maybe leaks only under pressure. Have a look see with engine running. No white smoke or balky starting in the morning?

Starts and runs great; no smoke. Will look again for pinhole.

Thanks

You can purchase a dye liquid to mix in with the coolant. It's extremely fluorescent under black light. Drive around for a while. Then borrow someone's disco lamp (black light), wait for night time, and poke around in the engine compartment and under the car to see if you notice any glowing dye.

Failing that, have you ever tried mixing in a couple of tablespoons of ground black pepper to your coolant? The flakes of pepper are pushed into pinholes by pressure in the system and they often block the hole effectively (and very cheaply).

Good luck! Max> Starts and runs great; no smoke. Will look again for pinhole.

When you first noticed the low coolant, did you notice it because the low coolant light came on or while you were checking fluids under the hood? Depending on that, if it was the blinking light, you might have other issues by now. Driving on low coolant too long will effect other parts. Do the glow dye trick. Your water flange on the side of the head could be warped. Weep hole on the water pump. Overheating the plastic parts on the radiator would split a seam and boil off before it hits the ground. I have seen dozens of leak conditions. You could have a leaky head gasket that is allowing coolant to go into the cylinder just enough to burn off without effecting the oil or smoke exhaust.

I would look a the driver side water flange on the head first. They usually crap out around 6 to 7 years.