Short term, not much problem.  Longer term, mixing coolant can be a problem.

I'd worry more about "I just bought recently".  I'd suggest that you properly flush the entire
system (see archives) and pressure test it.  While you're at it (in order of importance):

1)  change ALL fuel lines (old lines = major cause of engine fires)
2)  change all fluids and filters (engine, tranny)
3)  clean all elecctrical grounds (gremlins)
4)  check all brakes and wheel bearings (safety)

m2cw  M

--- Andy Stalick <andystalick@GMAIL.COM> wrote:

> I have a vanagon that I just bought recently.
...............
> Is it okay to mix coolants in between system flushes?

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