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I have 2000 Chevrolet blazer ls 4 door that I am replacing the speakers In and I need to know if the dash speakers are run in parallel if in series with the door speakers please help don't want to blow my new hu

test the ohms at the door speakers that will give you the best answer my guess is parellel but im not 100%

most likely parallel

The dash speakers are wired in parallel with the door speakers, but the factory dash speaker is just a tweeter and has its own in-line passive crossover. This is a pretty common OEM setup, and doesn't usually cause an impedance problem. However, if you replace the dash speaker with a full-range 4x6" speaker, and install a new 6-1/2" speaker in the door, then you'll be presenting a 2-ohm load to the new head unit and might run into trouble.