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Sorry, the question is so vague and all encompassing.
My initial response, and not to be curt, is remove the lower radiator hose and drain the coolant (if there isn't a petcock elsewhere on the radiator), remove the upper radiator hose, disconnect the automatic transmission oil cooler pipes (I would cover them with tinfoil and rubber band or cable tie the doubled tinfoil), remove the bolts holding the radiator in place and replace it. Other problems such as electric cooling fans for the engine may have to be removed, but you'd have to look at the car and see.
Hi, you can drain it by removing the lower radiator hose. A lot of car makers no longer provide a petcock for this reason. Just be careful if the coolant is hot. If you prefer using the petcock, you can buy a new one to replace it. Please let me know if you have more questions, and thanks for using FixYa.
Some models do not have a petcock, pulling the lower radiator hose will suffice in drainage. I suspect you know what you are doing since you have the correct nomenclature. Use extreme caution during this type of draining procedure when coolant is hot. If it is not on the lower left or right corners of radiator side facing engine, it is not equipped with a drain valve.
Best way to change the antifreeze is to open the petcock at the bottom of the radiator to drain the antifreeze/coolant. Once completely drained close the petcock and refill. Only other way would be to get a flush kit which involves cutting a heater hose, inserting a T and running a garden hose through the system with the radiator open at the bottom through the petcock while the motor is running. Hope this answers your question. Good luck! Greg
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