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I have a 98 Deville with a 4.6L v8 northstar. About a week ago, my car overheated. Let it cool down and turns out, all my water was gone! So, I found out that once the car gets up to running temp, pressure is pushing water out of the overflow tube, (there is only one reservoir with a tube right by the cap) untill there is no water left! Checked my oil, it's clean so I'm hoping it's not a faulty head gasket. But I think its weird that water is just coming right back out? Somebody please help me.. This car is the love of my life, but if I'm looking at over $3,000 in labor cause of a HG I think it's time to say goodbye. So someone please give me some good news!!! Also, it's not the thermostat. Just replaced that today.