Bad News. I recently had the same type of smell ( no leaks or puddles either) coming from my van and had to have the intake manifold gasket replaced due to the Dex-cool issue. It appears GM installed an inadequate/substandard gasket when they built the van. My van only had 65,000 miles on it. There's a Dex-cool settlement you could have applied for but repairs had to be made by May of 2008.
This is the only real complaint I've had with the van.
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Get the radiator and heater core, hoses and thermostat replaced. Also replace the mixing valve if needed. A radiator shop could give you an estimate and diagnose the problem better than I can online. I hope sincerly that this helps.
May not be either. Does the van run hot? If it doesn't then the coolant when it is heated is going to the overflow reservoir and if that fills up then out the overflow line to the driveway or the garage floor but everything is O.K.
Do you mean the brake pedal goes down to the floor, and doesn't stop the van at all? If that is what happened, check the master brake cylinder reservoir under the hood, on the driver's side of the engine, at the 'firewall', which is the engine compartment metal wall that separates the inside of the van from the engine compartment. Is it low, or empty? If the fluid is down, there is a leak somewhere. This must be fixed before you can drive it safely. Check under the van for wet areas, especially at the back side of the wheels, and any puddles or wet spots on the ground under the van. Let me know what you find, I'll try to help further.