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Defroster circuit question

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  • Defroster circuit question

    I have a question about the defroster circuit. It it on a timed relay? I am finding mixed answers about this and am spreading the net to find out.

    I want to connect my cool shirt pump to that circuit out of convenience and location.

    Thanks for looking!

  • #2
    94-97 its timed by the ecu.

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    • #3
      Some clarity - NA8 the switch input goes to the ECU which triggers the relay. NA6 looks like it has a dedicated timer on the control side, but the relay is just a normal relay.
      When I went megasquirt on my NA8, I put in a volvo timer relay from the junkyard.

      defrostna6.jpg

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      • #4
        Because attachments suck

        http://i.imgur.com/EWi5mpn.png

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        • #5
          Excellent information! Thanks so much! I have an NA6. I'll have to see if I can find the time length. I figure between pre-grid, session, and cool down, about 25-40 minutes.

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          • #6
            Volvo is 5 minutes, which is somewhat universal iirc.

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