Need help finding coolant leak on 1999 Pontiac Grand Prix

Check your radiator where the main radiator core connects into the side pieces on each sides of the radiator when they build them at the factory those to Ends or mounted on each side of the core and I have been known to leak from the seam between the two parts usually a small quart of radiator stop leak will fix it for about 30 days but the only way to really stop it is replace the entire radiator because no one repair radiators anymore just get it Hot up the hood and take a flashlight and look down both sides of the radiator inside and out you should see where the steam is coming from

Thanks Chris -- we tried that trick but could hardly see any steam, just what may have been a little up top near where the leak seemed to come from. Thanks as well JS -- we're not seeing foamy oil but we think it's the gaskets. Got some parts on order and will hopefully get it in a couple days. Only thing to update is that the low coolant light comes on when there's obviously plenty of coolant, so the coolant is probably not circulating very well. The light doesn't stay on, though, it comes and goes. Then when we park about 1/2 cup of coolant drips out for a minute.

Thanks! The mileage tells us it's time to do an oil change anyway so that's not a problem. We'll check on the sensor too. I'll update after we do the deed LOL

So the part came in Thursday and we replaced the upper manifold gasket set, but there's still some leaking going on. It's improved and the leak that I saw up near the steering fluid dipstick is gone, but below it there is some pooling which appears to be coming from a lower area, so I think the lower gaskets needed to be replaced, too. We just can't do that now -- a cold front is coming in and it's supposed to drop to 3F, and we don't have a garage. (We should have replaced them when we were elbows deep in the car this afternoon but I'm nursing a cold and the cold front came in so we had to stop.) The good news is that the oil looks good, there's no frothing or "turkey gravy" look to it. Thanks again for your help!

What is the small part that runs coolant from coolant container to engine