What happens when you mix red and blue antifreeze in your car? This video will show you. You generally shouldn’t do it as different coloured antifreeze and cause a chemical reaction. This can decrease the effectiveness of the antifreeze and can cause a brown gel like substance in your car. This can cause your engine to overheat and it clogs up pipes and can cause engine damage. Your best bet would be to totally drain the system and put the correct mix in.
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