Coolant will not sty in my car, I can fill it up and drive it a few miles and it is gone. I've check everywhere, and I can't find a leak. Where is it going????????
If you can't find the source of a leak or even a puddle under the car then I'm afafd that it looks like a blown head gasket. Remoe the oil filler cap and look inside. if there is anything in there that resmbles yelloish mayonaise that will confirm it. A Haynes manual for your car will help you decide whether the repairs is DIY or not.