hi my name is John.
Here what the service manual say.
The green and the orange engine coolant MUST NOT BE MIXED. When changing from one coolant to the other, complete system flush must be performed before using the replacement coolant
If you have green and you want red you need a flush machine to remove all the old and install the new.
Let me know if you need more.
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mastertech
ase master auto tech,triple chrys master tech,42 yr experinece,adv. level spec. ASE. HEV chrys spec.