Hello,
You can't find the radiator petcock because there isn't one for this particular model. You drain the cooling system with the lower radiator hose. In the diagrams down below I have included the procedures for draining and filling the cooling system from the vehicle manufacturer for your vehicle. Please go through them and let us know how everything turns out. I hope this helps.
Thanks,
Alex
2CarPros
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Tuesday, October 29th, 2019 AT 4:06 PM