unless someone has changed it your Alero has Dexcool in it. Dexcool is available at any auto parts store or Walmart.
Liquid coolant
DexcoolDexcool
A 2000 Oldsmobile Alero with a 2.2 engine will hold approximately 13 liters of coolant. Adding coolant to your vehicle is very important.
beside thermostat
The DEX-COOL coolant with 50/50 mix. It is an orange coolant. if you want to do it exactly how GM says you would have 50% DEX-COOL and 50% de-mineralized water
to cool the coolant in the engine
To change the antifreeze on a 2003 Alero once the car cools remove that radiator pressure cap. Pour in a gallon of pre mixed coolant.
Drain radiator through plug at bottom or rear of radiator Re-fill radiator with a 50/50 mixture of antifreeze and water slowly to prevent an air lock
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