Is it ok to use green colored coolant once or twice when orange coolant is recommended?
Never mix them. You can change if you flush out with water.
What happens if u do mix?
I believe you risk having it glob up and clog the cooling system.
Why would you want to change from the recomended coolant ?
Sounds like the coolant was low and some green was added.
Solution is to do a thorough coolant change, with a flush with water, and make sure the reservoir is emptied and rinsed out.
I would do exactly as you say then @texases , then just make sure the coolant you bought or had on hand was campatable with what ever you put in.
Concur with @texases. If you do have Dexcool (horrible stuff) then mixing the green stuff with it creates a dark, sticky mess that can cause your engine to overheat and may plug your radiator.
There is nothing inherently wrong with the coolant itself (Dexcool) but situations like a blown hose, water pump leaking or someone adds the wrong anti-freeze and it’s a recipe for disaster. That’s why I always remove Dexcool from any vehicle I own. Why tempt fate when other anti-freezes are readily available? I use the yellow variety and have never had a problem.
Dexcool is fine if and only if it gets replaced every 5 years, as per the GM service schedule.
Wait too long and all bets are off.
If you use DEXCOOL don’t mix it with anything else.