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A 50/50 mix of Green antifreeze and distilled water.
Air conditioner drain line stopped up or windshield seal leak that covers 99% of the reasons
It sounds like the heater core is leaking. Check for the smell of antifreeze and that will confirm the bad heater core.
An antifreeze leak.An antifreeze leak.
According to the 2000 Ford Expedition Owner Guide : It came from the factory with a 50 / 50 mix of distilled water and GREEN color antifreeze ( meeting Ford specification ESE-M97B44-A )
Most likely the water drain line from the AC evaporator is plugged and the condensate water and dust inside has fermented. When you park at idle with the AC on there will soon be a pool of water on the ground in he area behind the right front tire. If you don't have any then find the drain line and clean it. A leaking heater core can put antifreeze in that box also and it is not a pleasant smell.
Probably a blown or leaking head gasket.
When running the air conditioner, there might be a small leak of fluid on the 2000 Alero after it is parked. This is normal as it is only the overflow valve being released. Always check the antifreeze level before operating the vehicle in the summer to prevent low antifreeze warnings.
I had the same problem on my Expedition. The heater core needed to be replaced. Cost around 700.00.
Possibly a leak in the fuel system somewhere.
What type of antifreeze do I use for a 2000 bonneville
What type of antifreeze do I use for a 2000 bonneville