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I had the same problem. The 95 Bonnevilles had a problem with the upper intake plenum warping under higher engine temperatures. The antifreeze is coming from two water jackets that pass water through the intake into the throttle body (carburetor). The purpose of the water jackets is to heat the throttle body to operating temperature. When the upper plenum warps (sometimes up to 1/4 inch from corner to corner) the water is sucked into the engine and hydro-locks the motor. You will need another upper plenum and gasket set. You will also have to drain the radiator,remove the spark plugs (all of them) and crank the motor over to blow all of the coolant out of the cylinders. You can also count on new spark plugs, oil and oil filter, and possibly a new O2 sensor(they don't like coolant very much). The only good thing is that you really don't have a dead battery. When water enters a cylinder, the fluid cannot be compressed on the compression stroke. That is why it started bogging down and wouldn't start again.... the cylinders were filling up with water/coolant. You have to remember that car engines are basically a powerful air pump. All that is being compressed is air/fuel mixture, and when a liquid enters the cylinders all things stop until the fluid is drained. There have been many vehicles break crank shafts or pistons/rods in floods because they shift into lower gears when their tail pipe is under water to better deal with back pressure, a wave of water enters the intake, and the higher rpms of the motor is suddenly stopped by the water causing things to break. This is the same concept minus flood conditions, however the same thing is occurring. email Kevin.Armstrong@okbu.edu if you have any questions about this one.

Answeri agree it could be frothe throttle body. or it can be leaking in where the egr tube comes into the intake.regardless the intake needs to be replaced.
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โˆ™ 2011-09-13 17:52:05
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Q: What would cause a 1995 Bonneville to bog down and then not start again There is also antifreeze in the carburetor and the battery went dead what could be the problem?
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