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  1. M

    Hydronic Heater D5WZ Module Question

    Thanks Shop, appreciate your knowledge:)
  2. M

    Hydronic Heater D5WZ Module Question

    Thanks guys for your help and confirming the tech 2 may have some diagnostics. Yes, we’ll last year the issue with the batteries and cable replacement gm told me I needed a new heater so I took their word on it after they quickly looked at it. This year (a couple weeks ago) when I took it into...
  3. M

    Hydronic Heater D5WZ Module Question

    Yep, was factory and worked so good for 12 years or so. The heavy smoke I believe was when the voltage was too low and the igniter couldn’t fire the diesel properly. With good batteries etc and this other module it’s burning clean and working good. I did read some trouble shooting on this...
  4. M

    Hydronic Heater D5WZ Module Question

    Hi, I was curious if anyone has a suggestion for my locked D5WZ hydronic heater module. I have a 6.6 Duramax, 2006 savana 2500 van I bought new and the FOH has been working perfect up until last winter. What I think hurt it was I had a bad battery I was charging over and over again. [my bad]...
    • Mymax
    • Thread
    • Replies: 6
    • Forum: Van
  5. M

    Hi to everyone!

    I’m just new to the site and hoping to learn and read all these helpful posts. I’ve owned a diesel ... 6.6 Duramax since 2006 with great success :D Thank you
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