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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.

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You should go to a parts store and get a combustion leak tester and that will tell, yes or no on the head gasket.

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Thanks man. I'm going to do that first thing tomorrow! If that's not the issue, any other ideas on what could be causing this?

A plugged purge line to the surge tank


Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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I would replace the radiator cap for starters. Cap may not be holding pressure. cheap and easy


GM FAN FOREVER

Nice, clean, luxury= fine automobile

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"water" is gone? U did add antifreeze back? It's at proper concentration? Or are you adding straight water in a quick attempt to get something in system? Get new rad cap. Verify purge line is flowing. Use proper coolant concentration. If you are spewing 1-2 gals of fluid, ur surge tank area is wet. Perhaps surge tank has crack which is not letting system pressurize and leading to boiling over.

Edited by joeb

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I agree with rockfangd. Buy a new radiator cap. I had the same problem and it turned out the cap needed to be replaced. Not saying this is definitely the problem, but it's worth a try and not expensive.

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You can test the radiator cap with the kit from Autozone. Not that they don't go bad but personally, I have never had a bad radiator cap with all the cars I've owned over the years.


Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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Don't forget to test the kit for combustion products. They sell kits for this at auto parts stores.


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